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 drug can be used in both HIV and Hepatitis B virus? \nSelect and explain. \nA. Enfuvirtide, B. Emtricitabine, C. Abacavir, D. Acyclovir', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Emtricitabine is a NRTI which has dual action on\xa0HIV and Hepatitis B virus.', 'role': 'assistant'}]