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': 'Seton’s procedure is treatment for \nSelect and explain. \nA. Hemorrhoids, B. Fissure in ano, C. Fistula in ano, D. Pilonidal sinus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: It is used for high lying fistula in ano.', 'role': 'assistant'}]