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
[{'content': 'Following are features of ischaemic colitis except – \nSelect and explain. \nA. Thumb printing, B. Serrated mucosa, C. Increased mucosal fold thickness, D. Dilution of barium', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Signs of ischemic colitis :- Thumb printing, shallow ulcers (serrated mucosa), Bowel wall thickening of affected segment.', 'role': 'assistant'}]