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': 'Most common location of anorectal fistula \nSelect and explain. \nA. Intersphincteric, B. Transsphincteric, C. Suprasphincteric, D. Extrasphincteric', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Park classification of anorectal fistula is\nType 1. Intersphincteric - most common\nType 2. Transsphincteric\nType 3. Suprasphincteric\nType 4. Extrasphincteric', 'role': 'assistant'}]