This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Which of the following is used to maintain abstinence in alcohol dependence ? 
Select and explain. 
A. Naltrexone, B. Clonidine, C. Disulfiram, D. Naloxone
A: Naltrexone
Answer: A: Naltrexone 
Explanation: Ans. is 'a' i.e., Naltrexone o Naltrexone is the preferred agent for maintaince of abstinence in alcohol dependence.