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': 'False about ulcerative colitis \nSelect and explain. \nA. Continuous inflammation, B. Leadpipe appearance, C. String sign is seen, D. Crypt abscesses are typical', 'role': 'user'}, {'content': "Answer: C \nExplanation: String sign is seen in chron's disease.", 'role': 'assistant'}]