This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Medicine
Whole thickenss of bowel is involved with skin lesions in ? 
Select and explain. 
A. Crohn' disease, B. Ulcerative colitis, C. Irritable bowel disease, D. Both Crohn's and ulcerative colitis
A: Crohn' disease
Answer: A: Crohn' disease 
Explanation: <P>Davidson&;s principles and practice of medicine 22nd edition. *In crohn&;s disease there the entire wall of bowel is oedematous and thickened involving terminal ileum ,right side colon,jejunum.</p>