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
Inveed umbrella sign is seen in? 
Select and explain. 
A. CHPS, B. Ischemic colitis, C. Ileocecal TB, D. Crohn's disease
C: Ileocecal TB
Answer: C: Ileocecal TB 
Explanation: 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.