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': 'Which of the following statements regarding naltrexone are true ? \nSelect and explain. \nA. It is an opioid antagonist, B. It is used in alcohol dependence, C. It is used to treat opioid dependence, D. All of these', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]