This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti Microbial, Subject name: Pharmacology
Which of the following drug is not used in influenza? 
Select and explain. 
A. Oseltamivir, B. Amantadine, C. Ribavirin, D. Acyclovir
D: Acyclovir
Answer: D: Acyclovir 
Explanation: Ans. D. AcyclovirOseltamivir is neuraminidase inhibitor which can be given for both influenzas A and B. Amantadine is drug which inhibit the uncoating of influenza A virus RNA. Ribavirin has a broad spectrum antiviral activity which inhibit the synthesis of viral RNA. Acyclovir mainly inhibit the viral DNA and its drug of choice for herpes simplex infection.