The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A previously healthy 67-year-old man comes to the physician for routine health maintenance evaluation. He works at a community center and volunteers at a local homeless shelter. A tuberculin skin test shows an induration of 14 mm. An x-ray of the chest is normal. Treatment with an antimycobacterial drug is initiated. Two months later, he has numbness and burning over both feet and an unsteady gait. Physical examination shows decreased sensation to light touch extending from the soles of the feet to the mid-shin bilaterally. Which of the following is the most likely cause of this patient’s current symptoms?   (A) Accumulation of S-adenosylmethionine   (B) Intracellular accumulation of sorbitol   (C) Segmental demyelination of peripheral axons   (D) Impaired breakdown of glucose to ATP
['(A) Accumulation of S-adenosylmethionine <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Accumulation of S-adenosylmethionine \n (B) Intracellular accumulation of sorbitol \n (C) Segmental demyelination of peripheral axons \n (D) Impaired breakdown of glucose to ATP <> possible answers', '  A previously healthy 67-year-old man comes to the physician for routine health maintenance evaluation. He works at a community center and volunteers at a local homeless shelter. A tuberculin skin test shows an induration of 14 mm. An x-ray of the chest is normal. Treatment with an antimycobacterial drug is initiated. Two months later, he has numbness and burning over both feet and an unsteady gait. Physical examination shows decreased sensation to light touch extending from the soles of the feet to the mid-shin bilaterally. Which of the following is the most likely cause of this patient’s current symptoms? <> context@']