This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'Treatment of Herpes zoster: \nSelect and explain. \nA. Zidovudin, B. Valacyclovir, C. Ribavarin, D. Nevirapine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Valacyclovir (Ref: Jawetz, 27th/e, p. 470)* Famciclovir or valacyclovir are the DOC for Herpes Zoster.* Several antiviral compounds provide effective therapy for varicella, including acyclovir, valacyclovir, famciclovir and foscarnet. Acyclovir can prevent the development of systemic disease in varicella - infected immunosuppressed patients and can halt the progression of herpes zoster in adults. Acyclovir does not appear to prevent postherpetic neuralgia.", 'role': 'assistant'}]