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': 'Select the drug that is active against both HIV and hepatitis B virus : \nSelect and explain. \nA. Lamivudine, B. Indinavir, C. Didanosine, D. Efavirenz', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]