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
Oseltamivir is - 
Select and explain. 
A. Neuramindase inhibitor, B. Neuramindase activator, C. Carboxylase inhibitor, D. Carboxylase activator
A: Neuramindase inhibitor
Answer: A: Neuramindase inhibitor 
Explanation: Ans. is 'a' i.e., Neuramindase inhibitor o Oseltamivir and zanamivir are neuraminidase inhibitors and prevent the virion release by causing clumping of mature virions.o Both these drugs are active against influenza 'A' as well as influenza 'B1 virus,o Oseltamivir is a prodrug and is used orally,o Zanamivir is used intranasally - can cause bronchospasm.