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
Fleishner sign is characteristic of 
Select and explain. 
A. Ulcerative colitis, B. Crohn's disease, C. Ischaemic colitis, D. Ileocecal tb
D: Ileocecal tb
Answer: D: Ileocecal tb 
Explanation: Fleshner sign - Wide gaping of ileocecal value with narrowing of terminal ileum characteristic of Ileocecal tb.