This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Salivary Glands, Subject name: Surgery
While shaving, a 45-year-old teacher notices a marble-sized mass beneath his left ear. The mass is eventually excised, revealing which of the following benign parotid gland lesions? 
Select and explain. 
A. Glandular hyperophy, secondary to vitamin A deficiency, B. Cystic dilation, C. Mikulicz's disease, D. Wahin's tumor
D: Wahin's tumor
Answer: D: Wahin's tumor 
Explanation: Papillary cystadenoma lymphomatosum /Wahin's tumor/Adenolymphoma Exclusively seen in parotid gland Derived from salivary tissue inclusion in lymph node More common in males Associated with smoking Only tumor to show hot spot on TC99m-Peecnate Histopathology Papillary cystic pattern lined with columnar oncocytes and cuboidal cells with marked lymphoid component. Lined by a double layer of neoplastic epithelial cells resting on a dense lymphoid stroma sometimes bearing germinal centers =Mikulicz's disease involves chronic inflammation and swelling of the salivary glands, which is benign and usually painless