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
From A drugs which acts through inhibition of integrase activity of virus ? 
Select and explain. 
A. Raltegravir, B. Tiprinavir, C. Enfuviide, D. Etravirine
A: Raltegravir
Answer: A: Raltegravir 
Explanation: Ans. is 'a' i.e., Raltegravir