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': 'Drug of choice for chronic hepatitis–B is \nSelect and explain. \nA. Lamivudine, B. IFN-alpha, C. Ribavirin, D. Zidovudine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]