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
Following is least common about angiodyplasia of colon - 
Select and explain. 
A. Involvement of cecum, B. Involvement of rectum in 50% of cases, C. Affecting age group > 40 yrs., D. Cause of troublesome lower G.I. hemorrhage
B: Involvement of rectum in 50% of cases
Answer: B: Involvement of rectum in 50% of cases 
Explanation: None