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
Thyroglossal fistula develops due to - 
Select and explain. 
A. Developmental anomaly, B. Injury, C. Incomplete removal of thyroglossal cyst, D. Inflammatory disorder
C: Incomplete removal of thyroglossal cyst
Answer: C: Incomplete removal of thyroglossal cyst 
Explanation: Thyroglossal fistula is never congenital. It follows infection or inadequate removal of a thyroglossal cyst.