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

<passage>:
things to know there are always more." He led the way inside. Through thirst-cracked lips he rasped: "Water—quick!" Without a word, the bartender reached under the counter, brought out two glasses of water. The interplanetary con-men drank noisily, asked for more, until they had drunk eight glasses. Meanwhile, the bartender Harvey and Joe were breathing hard from having gulped the water so fast, but they were beginning to revive. They noticed the bartender's impersonal eyes studying them shrewdly. "Strangers, eh?" he asked at last. "Solar salesmen, my colonial friend," Harvey answered in his usual lush manner. "We purvey that renowned Martian remedy, La-anago Yergis , the formula for which was recently discovered by ourselves in the ancient ruined city of La-anago. Medical science is unanimous in proclaiming this magic medicine the sole panacea in the entire history of therapeutics." "Yeah?" said the bartender disinterestedly, polishing the chaser glasses without washing them. "Where you heading?" "Out of Mars for Ganymede. Our condenser broke down, and we've gone without water for five ghastly days." "Got a mechanic around this dumping ground you call a port?" Joe asked. "We did. He came near starving and moved on to Titan. Ships don't land here unless they're in trouble." "Then where's the water lead-in? We'll fill up and push off." "You dirty crook!" Joe roared. "Robbing honest spacemen!" Harvey nudged him warningly. "Easy, my boy, easy." He turned to the bartender apologetically. "Don't mind my friend. His adrenal glands are The round face of the barkeeper had assumed an aggrieved expression. "Folks are always thinkin' the other feller's out to do 'em," he said, shaking his head. "Lemme explain about the water here. It's bitter as some kinds of sin before it's purified. Have to bring it in with buckets and make it sweet. That takes time and labor. Waddya think—I was chargin' feller critters for water just out of devilment? I charge quantity, I'm able to quote a bargain price. Shucks, boys, it hurts me more to charge for water than it does for you to pay. I just got to, that's all." The mayor gestured to the native, who shuffled out to the tanks with them. The planetoid man worked the pump while the mayor intently watched the crude level-gauge, crying "Stop!" when it registered the wetted his lips expectantly. Harvey bravely counted off the bills. He asked: "But what are we to do about replenishing our battery fluid? Ten buckos a liter would be preposterous. We simply can't afford it." Johnson's response almost floored them. "Who said anything about charging you for battery water? You can have all you want for nothing. It's just the purified stuff that comes so high." After giving them directions that would take them to the free-water pool, the ponderous factotum of Planetoid 42 shook hands and headed is the victim of a difficult environment, and must charge accordingly." "Just the same," Joe griped, "paying for water isn't something you can get used to in ten minutes." In the fragile forest, they soon came across a stream that sprang from the igneous soil and splashed into the small pond whose contents, Five minutes later, panting heavily from the unaccustomed exertion of scrambling through the tangle of planetorial undergrowth, they burst into the open—before a clear, sparkling pool. But Joe was already on his knees, scooping up a handful of water and tasting it. "Sweet!" he snarled. They rushed back to the first pool, where Joe again tasted a sample. His mouth went wry. "Bitter! He uses only one pool, the sweet one! The only thing that needs purifying around here is that blasted mayor's conscience." "The asteroidal Poobah has tricked us with a slick come-on," said atmosphere. The pursuit of vengeance, Harvey realized, had taken a quick and "Bring him in here!" Johnson cried. "I mean, get him away! He's coming down with asteroid fever!" "Of course," replied Harvey calmly. "Any fool knows the first symptoms of the disease that once scourged the universe." "What do you mean, once cups—" "Relics of the past," Harvey stated. "One medication is all modern man requires to combat the dread menace, asteroid fever." "What's that?" asked the mayor without conviction. Instead of replying, Harvey hurried outside to the ungainly second-hand rocket ship in the center of the shabby spaceport. He returned within a few minutes, carrying a bottle. Joe was still stretched out on the bar, panting, his eyes slowly drink until most of the liquid was gone. Then he stepped back and waited for the inevitable result. Joe's performance was better than ever. He lay supine for several Joe recoiled. "I'm fine now!" he cried, and sprang off the bar to prove La-anago Yergis never fails, my friend," Harvey explained. "By actual test, it conquers asteroid fever in from four to twenty-three minutes, depending on the severity of the attack. Luckily, we caught don't charge too much," he said warily, "I might think of buying some." "We do not sell this unbelievable remedy," Harvey replied with dignity. "It sells itself." the man gradually won. "There ain't no words for that taste," he gulped when it was safe to talk again. "Medicine," Harvey propounded, "should taste like medicine." To Joe he said: "Come, my esteemed colleague. We must perform the sacred task to which we have dedicated ourselves." clearing and entered the ship. As soon as they were inside, Joe dropped his murderous silence and cried: "What kind of a dirty trick was that, giving me poison instead of that snake oil?" "That was not poison," Harvey contradicted quietly. "It was La-anago Yergis our specific for all known ailments, with the intention of selling yonder asteroidal tin-horn a bill of medical goods—an entire case, mind you. Was I to mix the extract with the water for which we had been swindled to the tune of ten buckos a liter? Where would our profit have been, then? No I had to use the bitter free water, of course." "But why use it on me?" Joe demanded furiously. Harvey looked reprovingly at his gangling partner. "Did Johnson ask to the same medicine "Joseph, I promise you that we shall get back every redsent of which least as good as the first he gagged. balanced between his pleasure at getting the fever remedy and his pain Harvey and Joe looked at each other. They hadn't been thinking about food at all, but suddenly they realized that they were hungry. "It's only water we were short of," Harvey said apprehensively. "We've got rations back at the ship." " H-mph! chance of company. Genius, the six-armed native, appeared from the dingy kitchen with two menus in one hand, two glasses of water in another, plus napkins, "Quite," said Harvey. "We shall order." For an hour they were served amazing dishes, both fresh and canned, the culinary wealth of this planetoid and all the system. And the service inhabitants of the super-dimension would be far more civilized than ourselves. Consequently, the man who could tap their knowledge would "It does, Mr. Johnson! Only charlatans like those who envied Doctor Dean's magnificent accomplishments could deny that fact." the simple key that would translate the somewhat metamorphosed

<question>:
How is Joe's asteroid fever cured?

<options>:
A The La-anago Yergis cures him.
B Nothing does - his sickness was a ruse.
C The bitter water that Harvey switched in cures him.
D The fresh water from the planet cures him.

<answer>:

B