This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neck, Subject name: Surgery
[{'content': 'Which of the following is true about thyroglossal cyst? \nSelect and explain. \nA. Secondary infection leads to sinus., B. 40% contains heterotopic thyroid tissue, C. Resolve spontaneously in 20-30% cases., D. Thyroglossal duct obliterates by 18th week of IUL', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) Resolve spontaneously in 20-30% cases.Ref: Sabistoris Text book of Surgery 20th Ed; Page No-1861* Thyroglossal duct cyst is a midline neck lesion that originates at the base of the tongue at the foramen cecum and descends through the central portion of the hyoid bone.* Present in any part from the thyroglossal tract foramen caecum to isthmus but most are found at or just below the hyoid bone.* Most commonly seen in 15-30 years of age.* Thyroglossal duct normally regresses by the time the thyroid gland reaches its final position.* Lined by pseudostratified columnar epithelium.* Complication of thyroglossal cyst:# Fistula# Papillary carcinoma# Infection* Sistrunk operation is the treatment of choice.', 'role': 'assistant'}]