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
Massive bleeding per rectum in a elderly patient is due to 
Select and explain. 
A. Colitis, B. Ca.colon, C. Diverticulosis, D. Peptic ulcer disease
C: Diverticulosis
Answer: C: Diverticulosis 
Explanation: MCC of massive bledding per rectum is diverticulosis.