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': 'An AIMS patients presents with fistula-in-ano. His CD4 count is below 50. What is the treatment of choice - \nSelect and explain. \nA. Seton, B. Fistulectomy, C. None, D. Both', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]