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
False regarding invlovement in Crohn's disease 
Select and explain. 
A. Anorectal area, B. Rectum, C. Small intestine with Rt. colon, D. Large intestine alone without involvement of small intestine
B: Rectum
Answer: B: Rectum 
Explanation: Ans. is 'b' i.e., Rectum