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
Pipe stem appearance in barium enema is seen in: 
Select and explain. 
A. Crohns disease, B. Ulcerative colitis, C. Schistosomiasis, D. Carcinoma colon
B: Ulcerative colitis
Answer: B: Ulcerative colitis 
Explanation: Ans. Ulcerative colitis