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: Pathology
[{'content': "All of the following are true about toxic megacolon EXCEPT: March 2013 (g) \nSelect and explain. \nA. Carries significant risk of perforation, B. Consistent feature of Crohn's disease, C. Colonic dilatation, D. Colectomy may be required", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. B i.e. Consistent feature of Crohn's disease In cases of ulcerative colitis, inflammation and inflammatory mediators can damage the muscularis propria and neuromuscular function leading to colonic dilation and toxic megacolon.", 'role': 'assistant'}]