This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
A person consumes large quantities of alcohol daily since 20 years.He is physically dependent on alcohol. Drug should be given to this person is: 
Select and explain. 
A. Disulfiram, B. Acamprosate, C. Naltrexone, D. Chlordiazepoxide
A: Disulfiram
Answer: A: Disulfiram 
Explanation: Disulfiram is the main drug tahtbsi used to make alcohol consumption an unpleasant experience. Disulfiram inhibit aldehyde dehydrogenase , alcohol is not metabolized and acetaldehyde accumulates which produces unpleasant symptoms and patient develops an aversion.All the other given drugs can be used but primarily displaces is tried. Ref: KD Tripathi 8th ed.