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
Toxic megacolon is seen as a complication in ? 
Select and explain. 
A. Crohn's disease, B. Ulcerative colitis, C. Colonic diverticulosis, D. Miliary TB
B: Ulcerative colitis
Answer: B: Ulcerative colitis 
Explanation: Toxic megacolon can arise as a  complication following chronic ulcerative colitis.