This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal Radiology, Subject name: Radiology
[{'content': "This appearance of colon is seen in : \nSelect and explain. \nA. Ulcerative colitis, B. Crohn's disease, C. Plummer Vinson syndrome, D. Chiladiti syndrome", 'role': 'user'}, {'content': 'Answer: A \nExplanation: The Lead pipe appearance of the colon is the classical barium enema finding in chronic Ulcerative colitis. Other findings of UC - Fine mucosal granularity, Pseudopolyp.', 'role': 'assistant'}]