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: Dental
[{'content': 'DOC for herpes zoster is – \nSelect and explain. \nA. Vidarabine, B. Acyclovir, C. Idoxuridine, D. Aclidine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: For typical cases of herpes zoster, oral acyclovir is used. Oral famciclovir or valaciclovir have advantage of a more convenient dosing.', 'role': 'assistant'}]