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: Ophthalmology
[{'content': 'Drugs of choice for corneal herpes is: \nSelect and explain. \nA. Idoxuridine, B. Acyclovir, C. Vidarabine, D. Amantadine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Acyclovir', 'role': 'assistant'}]