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: Surgery
[{'content': "False regarding invlovement in Crohn's disease \nSelect and explain. \nA. Anorectal area, B. Rectum, C. Small intestine with Rt. colon, D. Large intestine alone without involvement of small intestine", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Rectum", 'role': 'assistant'}]