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
[{'content': 'Massive colonic bleeding in a patient of diverticulosis is from \nSelect and explain. \nA. Inferior mesentric artery, B. superior mysentric artery, C. coeliac artery, D. Gastro duodenal artery', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 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.\n"Hemorrhage from a colonic diverticula is the most common cause of hematochezia in patients over the age of 60." - Harrison 16/e, p 1796', 'role': 'assistant'}]