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': "Which of the following is not an abdominal procedure for rectal prolapse? \nSelect and explain. \nA. Altmeir's procedure, B. Well's operation, C. Lahaul's operation, D. Ripstein's sling operation", 'role': 'user'}, {'content': "Answer: A \nExplanation: Altmeir's procedure involves excision of full thickness of the prolapsed rectum with pa of sigmoid followed by anastomosis of remaining pa of sigmoid to the anal canal from below and is hence a perineal procedure.", 'role': 'assistant'}]