This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Colon and Rectum - Polyps and Carcinoma, Subject name: Surgery
[{'content': 'Most common site of CA colon is - \nSelect and explain. \nA. Rectosigmoid Region, B. Ascending Colon, C. Descending Colon, D. Transverse Colon', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Rectosigmoid Region o The most common site for carcinoma colon is rectosigmoid.SITEFREQUENCYRECTUM38%SIGMOID COLON21%CAECUM12%TRANSVERSE COLON5.5%DESCENDING COLON4%SPLENIC FLEXURE3%ASCENDING COLON5%", 'role': 'assistant'}]