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. Ganciclovir, C. Ribavarin, D. Nevirapine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ganviclovir and foscarnet have been found to be effective in herpes zoster REF:ANANTHANARYANAN TEXT BOOK OF MICROBIOLOGY 9EDITION PGNO.474', 'role': 'assistant'}]