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': 'The following are complications of ulcerative colitis except - \nSelect and explain. \nA. Peptic ulceration, B. Arthritis, C. Sclerosing cholangitis, D. Toxic megacolon', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]