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: Pharmacology
Drug of choice for herpes simplex keratitis is : 
Select and explain. 
A. Acyclovir, B. Ganciclovir, C. Amantadine, D. Interferon
A: Acyclovir
Answer: A: Acyclovir 
Explanation: None