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 colonic bleeding in a patient of Di veiculosis is from - 
Select and explain. 
A. Inferior mesenteric aery, B. Superior mesentric aery, C. Coeliac aery, D. Gastro-duodenal aery
B: Superior mesentric aery
Answer: B: Superior mesentric aery 
Explanation: Ans. is 'b' i.e., Superior Mesentric Aery Although diveiculosis involves mainly the left side of colon, bleeding occurs mostly from right side of colon. Right side is supplied by superior mesentric aery. "Hemorrhage from a colonic diveicula is the most common cause of hematochezia in patients over the age of 60." - Harrison 16/e, p 1796