This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
A 60-year-old patient came with 4 episodes of massive bleeding per rectum. On examination the abdomen is soft and there is no tenderness, with bowel sounds being normal. The most likely diagnosis is 
Select and explain. 
A. Diverticulitis, B. Carcinoma rectum, C. Hemorrhoids, D. Peptic ulcer disease
A: Diverticulitis
Answer: A: Diverticulitis 
Explanation: (A) Diverticulitis # Diverticulitis, or inflammation of a diverticulum, is related to the retention of particulate material within the diverticular sac and the formation of a fecolith.> Consequently, the blood vessel is either compressed or eroded, leading to either perforation or bleeding