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
Viral HIV integrase inhibitor is : 
Select and explain. 
A. Zidovudine, B. Maroviroc, C. Raltegravir, D. Enfuvirtide
C: Raltegravir
Answer: C: Raltegravir 
Explanation: None