This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Substance Abuse, Subject name: Psychiatry
[{'content': 'Naltrexone is used for: \nSelect and explain. \nA. Cocaine, B. Alcohol dependence, C. Anorexia, D. Cannabis toxicity', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. Alcohol dependenceExplanationNaltrexone is a opioid receptor antagonist used to reduce or eliminate the subjective high associated with consumption of opioid and alcohol.It is approved by US FDA for alcohol dependence and for blockade of effects of exogenously administered opioids.', 'role': 'assistant'}]