This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Rectum, Subject name: Surgery
[{'content': "Most common cause of per rectal bleeding is: \nSelect and explain. \nA. Diverticulosis, B. Hemorrhoids, C. Crohn's disease, D. Cancer Colon", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) DiverticulosisRef: Sabiston Page 1151 Table* Most common cause of bleeding PR overall is diverticulosis* MC cause of Bleeding PR in children is Fissure in ano.', 'role': 'assistant'}]