<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A physician scientist is looking for a more efficient way to treat HIV. Patients infected with HIV mount a humoral immune response by producing antibodies against the HIV envelope proteins. These antibodies are the same antibodies detected by the ELISA and western blot assays used to diagnose the disease. The physician scientist is trying to generate a new, more potent antibody against the same HIV envelope proteins targeted by the natural humoral immune response. Of the following proteins, which is the most likely target of the antibody he is designing?? A: gp120, B: CXCR4, C: p24, D: p17, E: CCR5,  <response>: The question is asking about which protein would be the most likely target for an antibody designed to treat HIV infection. It provides background that patients naturally produce antibodies against HIV envelope proteins, and these are detected by diagnostic tests like ELISA and Western blot. The choices list different HIV proteins - gp120 and p24 are HIV envelope and core proteins, respectively. CXCR4 and CCR5 are cell receptors that HIV uses to enter cells. Since the goal is to generate antibodies against the same targets as the natural immune response, and those targets are the HIV envelope proteins, the most likely target for the new antibody would be gp120, one of the main HIV envelope proteins.A: gp120 