This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Commonest site for colonic diveicula is- \nSelect and explain. \nA. Ascending colon, B. Sigmoid colon, C. Transverse colon, D. Descending colon', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Sigmoid colon", 'role': 'assistant'}]