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': '"Lyre sign" is a feature of: \nSelect and explain. \nA. Cystic hygroma, B. Branchial Fistula, C. Bezold\'s abscess, D. Carotid body tumor', 'role': 'user'}, {'content': 'Answer: D \nExplanation: "Lyre sign" is splaying of internal and external carotid arterics because of carotid body tumor, seen on carotid angiogram.', 'role': 'assistant'}]