<prompt> Maraviroc acts as:Reverse transcriptase inhibitorProtease inhibitorEntry inhibitorNone of the above  <response>: 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. 