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': 'Which of the following antivirals cannot be used topically in the eye ? \nSelect and explain. \nA. Acyclovir, B. Ganciclovir, C. Idoxuridine, D. Famciclovir', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Answer- D. FamciclovirTopical antivirals used are - Acyclovir, Ganciclovir, triflurothymidine, Vidarabine, Idoxuridine.', 'role': 'assistant'}]