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
Which is never a cause of thyroglossal fistula ? 
Select and explain. 
A. Infection of thyroglossal cyst, B. Inadequate removal of thyroglossal cyst, C. Congenital, D. None of the above
C: Congenital
Answer: C: Congenital 
Explanation: Ans. is 'c' i.e., Congenital A thyroglossal duct cyst may rupture unexpectedly, resulting in a draining sinus known as a thyroglossal fistula. Thyroglossal fistula can develop when the removal of the cyst has not been fully completed. This is usually noticed when bleeding in the neck occurs, causing swelling and fluid ejection around the original wound of removal.