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
[{'content': "Whole thickenss of bowel is involved with skin lesions in ? \nSelect and explain. \nA. Crohn' disease, B. Ulcerative colitis, C. Irritable bowel disease, D. Both Crohn's and ulcerative colitis", 'role': 'user'}, {'content': 'Answer: A \nExplanation: <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>', 'role': 'assistant'}]