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
[{'content': 'Maraviroc acts as: \nSelect and explain. \nA. Reverse transcriptase inhibitor, B. Protease inhibitor, C. Entry inhibitor, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 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.', 'role': 'assistant'}]