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
[{'content': 'Naltrexone is used for which of the following poisoning - \nSelect and explain. \nA. Heroin, B. Atropine, C. Cannabis, D. Diazepam', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Heroin o Naltrexone is used in opioid poisoning and amongst the given options only heroin is an opioid. o Naltrexone is used orally for maintenance therapy in opioid poisoning, once it has been treated with naloxone. So, Naloxone : DOC for acute opioid (morphine) poisoning Naltrexone : Used for maintenance", 'role': 'assistant'}]