A patient presents with altered bowel habits thickening of terminal ileum, caecum, dilatation of distal and proximal ieum, antemesenteric sacculations, increased mesenteric fat, increased blood supply to adjacent mesentary. All are true except -

• A. Crohn's
• B. Ulcerative colitis
• C. Ischemic colitis
• D. Ileocaecal tb