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: Radiology
[{'content': 'Scalloping of the edge of the sigmoid colon on barium enema seen in – \nSelect and explain. \nA. Diverticulosis, B. Ulcerative colitis, C. Carcinoma colon, D. Pneumatosis intestinalis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Scalloping of the edge of sigmoid colon on barium enema is seen in ulcerative colitis.', 'role': 'assistant'}]