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': "Inveed umbrella sign is seen in? \nSelect and explain. \nA. CHPS, B. Ischemic colitis, C. Ileocecal TB, D. Crohn's disease", 'role': 'user'}, {'content': "Answer: C \nExplanation: The 'Fleischner sign'(also known as the 'Inveed umbrella sign'), refers to a widely gaping, thickened, patulous ileocaecal valve and a narrowed, ulcerated terminal ileum associated with Tuberculous involvement of the Ileocaecum.", 'role': 'assistant'}]