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': 'Which is never a cause of thyroglossal fistula - \nSelect and explain. \nA. Infection of thyroglossal cyst, B. Inadequate removal of thyroglossal cyst, C. Congenital, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: • A thyroglossal fistula usually presents as discharging sinus in the midline\xa0of the neck in the line of thyroid descent.\n• It is never congenital but follows infection or inadequate removal of a thyroglossal cyst\n• Acquired condition\nClinical Features\n• Presentation is with a fistulous opening near to the midline of the neck\n• The fistula may become infected and discharge pus\nTreatment\n• The fistula should be excised along with the thyroglossal tract upto the base of the tongue.\n• This requires removing the central (middle one third) of the hyoid bone.', 'role': 'assistant'}]