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
Maraviroc is used in treatment of: 
Select and explain. 
A. CMV, B. HSV, C. HIV, D. Measles
C: HIV
Answer: C: HIV 
Explanation: Maraviroc binds specifically and selectively to CCR5, one of two coreceptors necessary for entrance of HIV into CD4+ cells, thus blocking entry of CCR5-tropic HIV into these cells. Ref: Katzung 11th edition Chapter 49.