<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 78-year-old man receives chemotherapy for advanced hepatocellular carcinoma. Despite appropriate therapy, he dies 4 months later. Histopathological examination of the cancer cells shows the presence of a transmembrane efflux pump protein that is known to cause decreased intracellular concentrations of chemotherapeutic drugs. Which of the following best describes this membrane protein?? A: P-glycoprotein, B: Cadherin, C: Tyrosine receptor, D: G protein, E: Channel protein,  <response>: This is a question about a membrane protein that functions as a drug efflux pump, causing decreased intracellular concentrations of chemotherapy drugs in cancer cells. Based on the information provided, this protein likely belongs to the ATP-binding cassette ABC family of transporters, which use ATP hydrolysis to drive the efflux of substances out of cells. Of the answer choices provided, P-glycoprotein is a well-known ABC transporter that confers multidrug resistance in cancer cells by pumping drugs out of the cell. Cadherin is a cell adhesion protein, tyrosine receptor and G protein are signaling proteins, and channel proteins facilitate diffusion of ions and molecules across the membrane. Therefore, P-glycoprotein is the best answer.A: P-glycoprotein 