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': 'Most common cause of bleeding per rectum is \nSelect and explain. \nA. Hemorrhoids, B. Fissure in ano, C. Diarrhea, D. Rectal polyp', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most common cause of bleeding per rectum is - hemorrhoids.\nMost common cause of bleeding per rectum in children is - polyps.', 'role': 'assistant'}]