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': 'In clinical practice to label remission in the case of ulcerative colitis, all the features are needed, EXCEPT: \nSelect and explain. \nA. Stool frequency <3 /day, B. No bleeding, C. No Urgency, D. Normal looking mucosa in endoscopy', 'role': 'user'}, {'content': "Answer: D \nExplanation: In clinical practice, 'remission' mean a stool frequency <=3/day with no bleeding and no urgency. Sigmoidoscopy to confirm mucosal healing is generally unnecessary. Ref: Journal of Crohn's and Colitis (2012) 6, 965-990", 'role': 'assistant'}]