Read the following passage and questions, then choose the right answer from options, the answer should be one of A, B, C, D.

<passage>:
ship from HQ in Standard GPP Contract code for crash priority, which meant Top Grade Planetary Emergency, and don't argue about it, fellows, just get there, fast. Red Doctor Sam Jenkins took one look at the flashing blinker and slammed the controls into automatic gyros hummed, Ten minutes later the Red Doctor reached for the results of the Initial the folks on Morua II didn't want a Contract with Hospital Earth. And they're still in the jungle, as far as their medicine goes. Witch doctors and spells." He tossed the Info-card down the chute with a growl. "So now we have an emergency call from them in a Contract code they couldn't possibly know." The surgeon in the green undershorts chewed his lip. "Looks like there, are we?" "What else? You know the law. Instantaneous response to any crash-priority call, regardless of circumstances—" "Law be damned," Stone cried. "File a protest with HQ. Cancel the course bearings and thumb our noses at them!" we're supposed to think. We answer the call, and beef about it later. If we still happen to be around later, that is." It had always been that way. Since the first formal Medical Service Contract had been signed with Deneb III centuries before, Hospital Earth had laboriously built its reputation on that single foundation stone: immediate medical assistance, without question or hesitation, whenever and wherever it was required, on any planet bound by Contract. That was the law, for Hospital Earth could not afford to jeopardize a Contract. In the early days of galactic exploration, of course, Medical Services transport, and in production techniques—but Earth stood unrivaled in its development of the biological sciences. Wherever an Earth ship landed, the crew was soon rendering Medical Services of one sort or another, whether they had planned it that way or not. On Deneb III the Medical Service Contract was formalized, and Hospital Earth came into being. Into all known corners of the galaxy ships of the General Practice Patrol were dispatched—"Galactic Pill Peddlers" forging a chain of Contracts from Aldebaran to Zarn, accepting calls, diagnosing ills, arranging for proper disposition of whatever medical problems they came across. Serious problems were shuttled back to Hospital Earth without delay more frequently the GPP crews—doctors of the Red and Green services, representing the ancient Earthly arts of medicine and surgery—were able to handle the problems on the spot and by themselves. It was a rugged service for a single planet to provide, and it was costly. Many planets studied the terms of Contract and declined, crash into a landing slot on the edge of the city. As Sam Jenkins and Wally Stone picked themselves off the bulkheads, trying to rearrange the scarlet and green uniforms of their respective services, the main physicians, eh?" He eyed them up and down as though he disapproved of wrapped like a mummy in bedclothes of scarlet interwoven with gold The Red Doctor blinked at his companion, then turned to Aguar. "What He does not die. We have you here now. You are doctors, you say. Cure him." They walked to the bedside and lifted back the covers. Jenkins took a "For days," the Moruan growled. "He can't speak. He grows hot and cannot eat. He moans until the Palace trembles." "What about your own doctors?" Aguar spat angrily on the floor. "They are jealous as cats until trouble comes. Then they hide in the caves like chickens. See the is all over. We have heard about you wizards from Hospital Earth. You cure all, the stories say. You are very wise, they say. You balance "We'll need supplies and information from our ship. We'll have to consult your physicians. We'll need healthy Moruans to examine—" "But you will cure him," Aguar said. in the control room of the Lancet . "Sam, we can't touch oxygen-breathers, which means they manage internal combustion of carbohydrates, somehow. From the grey skin color I'd guess at a cuprous these specimens Aguar has rounded up for us." They dug in frantically. Under normal conditions a GPP ship would send in a full crew of technicians to a newly-Contracted planet to make the initial Bio-survey of the indigenous races. Bio-chemists, physiologists, anatomists, microbiologists, radiologists—survey workers from every Service would examine and study the new clients, take them apart cell by cell to see what made them tick. response because of its utter lack of organization. But a creature with an organized central nervous system and a functional division of work among organ systems could be categorized, tested, studied, and compared, and the information used in combating native disease. Given no major setbacks, and full cooperation of the natives, the job only took about six months to do— For the crew of the Lancet handled external examinations and blood and tissue chemistries Stone ran the X-ray and pan-endoscopic examinations. After four grueling hours the Red Doctor groaned and scowled at the growing pile of data. "Okay. It seems that they're vaguely humanoid. And that's about all we the Red Doctor cut him off. "It adds up," he said heatedly. "You've got the power, you've got your you show us." "Now or never." Jenkins threw open the door and nodded to the guards. "I'll be in the sickroom in a very short while. If you're with me, I'll see you there. If not—" He fingered his throat suggestively. As soon as they had gone Jenkins dived into the storeroom and began promises, pills and post-mortems. That's the Medical service for you." Sam grinned. "Maybe you should operate on him. That would open their eyes all right." "No thanks, not me. This is a medical case and it's all yours. What do you want me to do?" "Stay here and try your damnedest to get through to HQ," said Sam had been thrown. As a couple of cowering guards crept in to remove the braziers, Red Doctor Jenkins drew the wizard aside. "Tell me what spells you've already used." Hurriedly, Kiz began enumerating, ticking off items on hairy fingers. ominous purple color. Faster! " Jenkins shouted to Kiz at the mortar, and began stripping off the sodden bedclothes. "Blankets, now—plenty of them." The plink-plink rose to a frantic staccato as Jenkins checked the patient's vital signs, wiped more sweat from his furry brow. Quite each other like long-lost brothers at a sad farewell. "I finally got through to somebody at HQ," he said as the Red Doctor climbed aboard. "It'll take them twenty days at least, to get help, considering that Morua is not a Contract planet and we're not supposed to be here in the first place, but that's the best they can do...." "Tell them to forget the armada," said Jenkins, grinning. "And anyway, they've got things all wrong back at HQ." He brandished a huge roll of parchment, stricken through with the colors of the seven Medical Services of Hospital Earth. "Take a look, my boy—the juiciest Medical Services Contract that's been written in three centuries—" He tossed the Contract in the dry-storage locker with a sigh. "Old Kiz just doctors ," said Jenkins. "They expected them, obviously, since that was the only level of medicine they could understand. And incidentally, the only level that could "Not quite," said the Red Doctor. "You're forgetting that I had one other prescription to use—the oldest, most trustworthy healer-of-all-ills known to medicine, just as potent now as it was a thousand years ago. Without it, Hospital Earth might just as well pack adjusted the scarlet band of the Red Service across his shoulders. "We

<question>:
What do the colors in the physicians' titles mean?

<options>:
A Stone focuses his practice on medication and Jenkins is a surgeon
B Jenkins focuses his practice on medication and Stone is a surgeon
C They both practice emergency medicine
D They can handle all medical problems on the spot

<answer>:

B