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: Psychiatry
[{'content': 'Which of the following is the drug of choice for opioid overdose \nSelect and explain. \nA. Clonidine, B. Naloxone, C. Buprenorphine, D. Flumazenil', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Naloxone is a central opioid antagonist given intravenously in opioid drug poisoning.', 'role': 'assistant'}]