This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Surgery
[{'content': 'Hotspot on Tc-99 is seen in which parotid tumour? \nSelect and explain. \nA. Pleomorphic adenoma, B. Adenoid cystic carcinoma, C. Acinic cell tumour, D. Wahin tumour', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Wahin tumour, or papillary cystadenoma lymphomatosum, is the second most common benign parotid tumour and occurs most often in older white men. Because of the high mitochondrial content within oncocytes, the oncocyte-rich Wahin tumour and oncocytomas incorporate technetium-99m and appear as hot spots on radionuclide scans.Ref: Sabiston, 20e, page no: 830', 'role': 'assistant'}]