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': 'Naltrexone is used in opioid dependene to \nSelect and explain. \nA. Prevent respiratory depression, B. Treat withdrawal symptoms, C. Prevent relapse, D. Treatment of opioid overdose', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Prevent relapse Naltrexone is a pure opioid antagonist It is a competitive antagonist at all opioid receptors. It can be used orally, to assist in the rehabilitation of ex-opioid abusers who are fully withdrawn (otherwise it will induce an acute withdraw! syndrome). A patient who then takes an opioid, fails to experience the kick or euphoria because of the opioid antagonistic actions of the Naltrexone.', 'role': 'assistant'}]