<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 38-year-old man presents with concerns after finding out that his father was recently diagnosed with colon cancer. Family history is only significant for his paternal grandfather who also had colon cancer. A screening colonoscopy is performed, and a polyp is found in the ascending proximal colon, which on biopsy shows adenocarcinoma. A mutation in a gene that is responsible for which of the following cellular functions is the most likely etiology of this patients cancer?? A: Inhibitor of apoptosis, B: Inhibits progression from G1 to S phase, C: Cytoskeletal stability, D: DNA mismatch repair, E: RAS cycle transduction inhibitor,  <response>: This is a question about the genetic etiology of colon cancer in a 38-year-old man with a family history of colon cancer. The key information is that he has a polyp with adenocarcinoma and a family history of colon cancer in his father and paternal grandfather. This suggests an inherited predisposition to colon cancer at a young age. The question asks about which cellular function is most likely mutated to cause his cancer. Based on his family history and young age of onset, the most likely etiology is a mutation in a DNA mismatch repair gene. These mutations lead to microsatellite instability and increased risk of colon cancer at a young age.D: DNA mismatch repair 