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': "The origin of thyroglossal duct is \nSelect and explain. \nA. Foramen caecum, B. Tuberculum impar, C. Rathke's pouch, D. Rosenmuller's fossa", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]