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': 'The drug used to treat acyclovir resistant Herpes Simplex Virus (HSV) and Varicella Zoster Virus (VZV) infection is : \nSelect and explain. \nA. Foscarnet, B. Valacyclovir, C. Abacavir, D. Ganciclovir', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]