This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Viral, Subject name: Pharmacology
Acyclovir is used in - 
Select and explain. 
A. Herpes keratitis, B. CMV retinitis, C. HepatitisC, D. Hepatitis B
A: Herpes keratitis
Answer: A: Herpes keratitis 
Explanation: Ans. is 'a' i.e., Herpes keratitisAntiviral DrugIts UseAcyclovirHerpes Simplex Virus Varicella Zoster VimsGanciclovirCMV and HS VFoscamet (i.v.)CMVOseltamivir (oral)Influenza A & influenza BRibavirinChronic HCV (with IFN-?)LamivudineHIV. Chronic HBVEntecavirHBV resistant to lamivudine