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

<passage>:
"To celebrate," Ferris said. The colonel shrugged. "That's as good a reason as any." bewilderment. IV Macklin was playing jacks. He didn't have a head on his shoulders and he was squatting on a great "Do you think we'll have to use force on Macklin to get him to "Hello?" Elliot Macklin said. carried away for a moment. But Macklin is exactly what we need for a Macklin had answered the "Oh, you want to know if my wife is around. No, she's asleep. That Army doctor, Colonel Sidney, he gave her a sedative. I wouldn't let him give me anything, though." now Macklin—" Elliot Macklin had inherited the reputation of the late Albert Einstein able to frame an argument with it. Macklin was in his early fifties but For the past seven years Macklin—who "But he won't like you fixing me up more." "But he can't stop me! Not if you want me to do it. Now listen to me—I The only thing that could delay the project was Macklin's health. Despite his impressive body, some years before he had suffered a mild stroke ... or at least a vascular spasm of a cerebral artery. It was behind the blond imitation wood desk, watching him disinterestedly. "Do you suppose the Great Man will actually show up?" Ferris demanded, pausing in mid-stride. "I imagine he will," Mitchell said. "Macklin's always seemed a decent their smug faces." Sometimes, Mitchell reflected, Ferris displayed a certain lack of Elliot Macklin entered in a cloud of pipe smoke and a tweed jacket. He Macklin dropped on the edge of the desk and adjusted his pipe. "Now Macklin nodded. "That's right, Steven. Migraine." "I would have said the common cold," Macklin replied, "but I suppose "How can you have a specific for a number of different causes?" Macklin "That's fine," Macklin said, sucking on his pipe. "And this effect that telencephalon section of the frontal lobes. It's caused by an over-production of the pituitary gland. We have artificially bred a Macklin coughed. "I don't want to overestimate my value but the "I'm tempted," Macklin said hesitantly, "but the answer is go. I mean Macklin ran the back of his knuckles across his forehead. "I really "That's not so bad," Macklin said. "How low can it get?" A dew of perspiration had bloomed on Macklin's forehead. "Is there much Macklin held his head in both hands. "Why did you two select Macklin groped in his pocket for a pen. "Don't be so stuffy and conservative, Mitchell! Macklin's cured, isn't he? By established periodic cycle he should be suffering hell right "It's Macklin's wife," Ferris said. "Do you want to talk to her? I'm no "What do you mean by that, Mrs. Macklin," Mitchell said sharply. heroin." "That's absurd. What makes you think a thing like that?" "The—trance he's in now." "Mrs. Macklin! I think I had better talk to you later when you are Macklin?" he asked without removing his hand from the telephone. Together they marched over to the cages and peered through the honeycomb pattern of the wire. The test chimp, Dean, was sitting peacefully in a corner scratching under his arms with the back of his knuckles. Jerry, their control in the experiment, who was practically Dean's twin except that he had received no injection of the E-M Virus, was stomping up and down punching his fingers through the wire, worrying the lock on the cage. "Jerry "Never mind, doctor. It was a form of humor. I think we had better see exactly what is wrong with Elliot Macklin." "There's nothing wrong with him," Ferris snapped. "He's probably just trying to get us in trouble, the ingrate!" Macklin's traditional ranch house was small but attractive in dum-de-de-dum-dum-dum . As they waited Mitchell glanced at Ferris. He seemed completely Mrs. Macklin was an attractive brunette in her late thirties. She wore "You are the gentlemen who gave Dr. Macklin the unauthorized The colonel smiled thinly. "Dr. Macklin is my concern. And everything suddenly realized Macklin used a pipe as a form of masculine protest to "Not a thing," Sidney said. "He's the healthiest, happiest, most well-adjusted man I've ever examined, Carson." "But—" Colonel Carson protested. Mitchell and Ferris stared at Colonel Carson and Macklin and at each other. "What did he mean, Macklin is an idiot?" Mitchell asked. "Not an idiot," Colonel Carson corrected primly. "Dr. Macklin is a moron. He's legally responsible, but he's extremely stupid." "I'm not so dumb," Macklin said defensively. "I beg your pardon, sir," Carson said. "I didn't intend any offense. But according to all the standard intelligence tests we have given you, "But—" Mitchell said, impatient to examine Macklin for himself. "Very "We merely cured him of his headaches," Mitchell said. "How?" some kind of a disease to rot his brain?" "No, no! Could I talk to the other man, the doctor? Maybe I can make him understand." "All I want to know is why Elliot Macklin has been made as simple as if Mitchell groaned. He was abruptly sure Ferris was correct. The colonel drew himself to attention, fists trembling at his sides. is replaceable. But the chances of an Elliot Macklin are very nearly "Just a moment," Mitchell interrupted, "we can cure Macklin." "You can ?" Carson said. For a moment Mitchell thought the man was "Good!" Carson clasped his hands and gave at least slightly at the knees. "Just you wait a second now, boys," Elliot Macklin said. He was leaning in the doorway, holding his pipe. "I've been listening to what you've Macklin slowly shaking his head. "No, sir!" the mathematician said. "I shall not go back to my original state. I can remember what it was like. Always worrying, worrying, worrying." Macklin nodded. "Troubled, anyway. Disturbed by every little thing. peaceful this way. My head doesn't hurt. I've got a good-looking wife and all the money I need. I've got it made. Why worry?" Colonel Carson opened his mouth, then closed it. "That's right, Colonel. There's no use in arguing with him," Mitchell said. "It's not his decision to make," the colonel said. "He's an idiot now." They found Mrs. Macklin in the dining room, her face at the picture "Y-yes," Colonel Carson said, "but he's not himself. He refused the treatment. He wants to remain in his state of lower intelligence." was my original thought. But I've redecided." "Redecided!" Carson burst out almost hysterically. where he never had a moment's peace from worry and pressure. He's happy now. Like a child, but happy." Ferris' antitoxin treatment is the best method of restoring Dr. Macklin "It isn't quite the same, Colonel. Elliot Macklin has a history of vascular spasm, a mild pseudostroke some years ago. Now you want to Macklin," Mitchell interjected. Her mouth grew petulant. "I don't care. I would rather have a live husband than a dead genius. I can take care of him this way, make him comfortable...." "I'm no psychiatrist," Mitchell said, "but I think she wants Macklin "No," Mitchell said. "She's an intelligent woman unconsciously jealous of her husband's genius." "Maybe," Carson said. "I don't know. I don't know what the hell to tell

<question>:
What caused Macklin to lose his intelligence?

<options>:
A He had suffered a stroke
B His brain cells were not working properly
C He was using heroin
D He was only pretending

<answer>:

B