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: Unknown
[{'content': 'True about ulcerative colitis are all except \nSelect and explain. \nA. 20% end up in colectomy., B. The highest risk of UC requiring surgery is in 1st year., C. Extra intestinal problems of UC are managed medically, D. Steroid dependent cases needs surgery.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref. Sabiston Textbook of Surgery. Pg. 1340\nExtraintestinal manifestations of ulcerative colitis respond to colectomy except Primary sclerosing cholangitis .', 'role': 'assistant'}]