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': "Sistrunk's operation is done for: \nSelect and explain. \nA. Thyroglossal cyst, B. Thyroglossal fistula, C. Both the above, D. None of the above", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]