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': 'In intestine, lipoma is commonest in - \nSelect and explain. \nA. Rectum, B. Sigmoid colon, C. Caecum, D. Ileum', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]