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: Pathology
A Salivary gland tumour, which histologically shows a double layer of epithelial cells based on a reactive lymphoid stroma, is 
Select and explain. 
A. Pleomorphic adenoma, B. Mucoepidermoid carcinoma, C. Acinic cell tumour, D. Warthin tumour
D: Warthin tumour
Answer: D: Warthin tumour 
Explanation: None