<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 23-year-old male with a homozygous CCR5 mutation is found to be immune to HIV infection. The patients CCR5 mutation interferes with the function of which viral protein?? A: Reverse transcriptase, B: gp120, C: gp41, D: p24, E: pp17,  <response>: This question is asking about a patient with a homozygous CCR5 mutation that makes him immune to HIV infection. The CCR5 receptor is one of the main co-receptors that HIV uses to enter and infect CD4 T cells. Individuals who are homozygous for the CCR5 delta32 mutation lack functional CCR5 receptors, making their CD4 T cells resistant to HIV infection. The question asks which viral proteins function is interfered with by the CCR5 mutation. The HIV envelope glycoprotein gp120 binds to the CD4 receptor and CCR5CXCR4 co-receptors to mediate viral entry. The other answer choices are HIV proteins involved in other steps of the viral life cycle like reverse transcription reverse transcriptase, membrane fusion gp41, viral core formation p24, or packaging pp17.Therefore, the CCR5 mutation interferes with the function of the HIV envelope protein gp120 by preventing it from binding to the CCR5 co-receptor.B: gp120 