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': 'Thyroglossal fistula develops due to - \nSelect and explain. \nA. Developmental anomaly, B. Injury, C. Incomplete removal of thyroglossal cyst, D. Inflammatory disorder', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Thyroglossal fistula is never congenital. It follows infection or inadequate removal of a thyroglossal cyst.', 'role': 'assistant'}]