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
Drugs used in alcohol abstinence - 
Select and explain. 
A. Disulfiram, B. Nalterxone, C. Chordiazepoxide, D. Morphine
A: Disulfiram
Answer: A: Disulfiram 
Explanation: disulfiram blocks metabolism of alcohol causing aldehyde to accumulate causing headache , flushing , nauseous, Ref Harrison 20th edition pg 99e