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
Which of the following antivirals cannot be used topically in the eye ? 
Select and explain. 
A. Acyclovir, B. Ganciclovir, C. Idoxuridine, D. Famciclovir
D: Famciclovir
Answer: D: Famciclovir 
Explanation: Answer- D. FamciclovirTopical antivirals used are - Acyclovir, Ganciclovir, triflurothymidine, Vidarabine, Idoxuridine.