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 diverticulosis is from 
Select and explain. 
A. Inferior mesentric artery, B. superior mysentric artery, C. coeliac artery, D. Gastro duodenal artery
B: superior mysentric artery
Answer: B: superior mysentric artery 
Explanation: Although diverticulosis involves mainly the left side of colon, bleeding occurs mostly from right side of colon. Right side is supplied by superior mesentric artery.
"Hemorrhage from a colonic diverticula is the most common cause of hematochezia in patients over the age of 60." - Harrison 16/e, p 1796