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 a treatment method for fissure in ano? \nSelect and explain. \nA. Sitz bath, B. Botox injection, C. Diltiaem gel, D. Seton’s procedure', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Seton’s procedure is done for fistula in ano.', 'role': 'assistant'}]