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
Integrase inhibitors approved for HIV is: 
Select and explain. 
A. Raltegravir, B. Indinavir, C. Lopinavir, D. Elvitegravir
A: Raltegravir
Answer: A: Raltegravir 
Explanation: Ans. is 'a' i.e., Raltegravir o Raltegravir is an integrase inhibitor which is used in combination with other antiretroviral agents in treatment of patients with ongoing HIV-1 replicaiton. o Elvitegravir is also an integrase inhibitor. But it is in phase-3 trial (not approved).