This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition, Subject name: Medicine
[{'content': 'Drugs used in alcohol abstinence - \nSelect and explain. \nA. Disulfiram, B. Nalterxone, C. Chordiazepoxide, D. Morphine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: disulfiram blocks metabolism of alcohol causing aldehyde to accumulate causing headache , flushing , nauseous, Ref Harrison 20th edition pg 99e', 'role': 'assistant'}]