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
Which is the integrase inhibitor used in treatment of HIV ? 
Select and explain. 
A. Raltegravir, B. Indinavir, C. Lopinavir, D. Fosamprenavir
A: Raltegravir
Answer: A: Raltegravir 
Explanation: None