This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal Radiology, Subject name: Radiology
[{'content': 'Not a feature of Ulcerative Colitis? \nSelect and explain. \nA. Fine mucosal granularity, B. Pseudopolyps, C. String sign of Kantor, D. lead Pipe Appearance', 'role': 'user'}, {'content': "Answer: C \nExplanation: * String sign of Kantor is seen in Crohn's Disease CROHN'S DISEASE ULCERATIVE COLITIS Signs seen : 1. Target sign / Halo sign 2. Comb sign 3. Rose thorning sign 4. Creeping fat sign 5. String sign of Kantor Signs seen : 1. Mucosal granularity 2. Lead pipe appearance 3. Collar button sign 4. Loss of haustration", 'role': 'assistant'}]