This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Viral Drugs, Subject name: Pharmacology
[{'content': 'Which of the following drug is used for prophylaxis of H1N1 influenza virus infections? \nSelect and explain. \nA. Oseltamivir, B. Abacavir, C. Tenofovir, D. Acyclovir', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Oseltamivir, Zanamivir, Peramivir are neuraminidase inhibitor which are used for treatment and prevention of HINI and H5N1 influenzae. Acyclovir: Acyclic guanosine derivative with clinical activity against HSV1, HSV2, and VZV, but it is 10 times more potent against HSV1 and HSV2 than VZV. Tenofovir, Abacavir: NI, used in HIV.', 'role': 'assistant'}]