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: Medicine
[{'content': "Which one of the following conditions commonly predisposes to Colonic carcinoma? \nSelect and explain. \nA. Ulcerative colitis, B. Crohn's disease, C. Diverticular disease, D. Ischaemic colitis", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]