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': 'Sistrunks procedure is used for \nSelect and explain. \nA. Thyroglossal cyst, B. Reidel thyroiditis, C. Thymic aplasia, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sistrunks procedure is removal of cyst and tract till base of tongue.', 'role': 'assistant'}]