<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A pathologist is investigating the cytology of cells that have been infected with a particularly virulent strain of the influenza virus. The physician suspects that the virus results in cell death after viral replication in order to expedite the spread of the virus. She recalls that there are three known biochemical mechanisms of initiating programmed cellular death: 1 transmembrane receptor-mediated interaction, 2 stimuli producing intracellular signals leading to mitochondrial-initiated events, and 3 release of cytoplasmic granules into a cell via a perforin molecule. Which of the following biochemical components plays a common role in all of these 3 processes?? A: FAS ligand, B: Caspase-3, C: Bax, D: Bcl-2, E: CD-95 protein,  <response>: This is a multiple choice question asking about the biochemical components that play a common role in the three known mechanisms of initiating programmed cellular death: 1 transmembrane receptor-mediated interaction, 2 stimuli producing intracellular signals leading to mitochondrial-initiated events, and 3 release of cytoplasmic granules into a cell via a perforin molecule. The question stem provides background information on a pathologist investigating virulent influenza virus infection and programmed cell death pathways. To answer the question, we need to identify a biochemical component that participates in all three cell death pathways. Based on the information provided in the question stem, we can analyze each answer choice:A FAS ligand - Participates in receptor-mediated cell death but not the other pathways.B Caspase-3 - Plays a role in both receptor-mediated and mitochondrial cell death pathways. C Bax - Involved in mitochondrial cell death pathway.D Bcl-2 - Anti-apoptotic protein, does not play a common role.E CD-95 protein - Involved in receptor-mediated cell death. Based on this analysis, caspase-3 is the best answer as it participates in two of the three cell death pathways mentioned in the question stem.B: Caspase-3 