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': "Recurrent prolapse of the rectum in children is treated by \nSelect and explain. \nA. Thiersh wiring, B. Digital reposition, C. Excision, D. Ripstein's operation", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]