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: Pathology
[{'content': 'Following are true about thyroglossal cyst EXCEPT \nSelect and explain. \nA. Often occur in children; they may also present in adults, B. Rarely may contain only functioning thyroid tissue, C. Treated surgically by Sistrunks operation, D. Moves downwards on tongue protrusion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]