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
Lead pipe appearance is seen in 
Select and explain. 
A. Chron's disease, B. Ulcerative colitis, C. Schistosomiasis, D. Carcinoma colon
B: Ulcerative colitis
Answer: B: Ulcerative colitis 
Explanation: B i.e. Ulcerative colitis