This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Small Intestine - Crohn's Disease, Subject name: Surgery
[{'content': "Crohn's Disease most commonly affects the - \nSelect and explain. \nA. Ileum, B. Rectum, C. Duodenum, D. Stomach", 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Ileum Commonest sites of various intstinal diseasesUlcerative colitisRectumCrohn's diseaseIleumCA colonRectumDiverticulosisSigmoid colon", 'role': 'assistant'}]