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': 'Best surgery for grade IV hemorroids \nSelect and explain. \nA. Open hemorroidectomy, B. Sclerotherapy, C. Ligation of artery, D. Stapled hemorroidopexy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Stapled hemorroidopexy is surgery of choice for grade IV hemorrhoids.', 'role': 'assistant'}]