This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Salivary Gland, Subject name: Surgery
[{'content': "Papillary cystadenoma lymphomatosum is otherwise called: \nSelect and explain. \nA. Pleomorphic adenoma, B. Warthin's tumour, C. Mucoepidermoid carcinoma, D. Medullary carcinoma", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans: b (Warthin's tumour) Ref: Bailey & love, 23th ed,p. 1659;WARTHINS TUMOUR* It is the second most common benign tumour of the parotid gland. (1 st is pleomorphic adenoma)* It consists of both epithelial and lymphoid elements and is also known as adenolymphoma. (Probably arises from parotid tissue trapped in lymph nodes within parotid gland)* Also called papillary cystadenoma lymphomatosum .* Tumour arises only in parotid gland.* Almost always arises in lower portion of the parotid gland overlying the angle of mandible* Common in males.* Age - 5th to 7th decade.* Assosciation is seen with smoking.* Bilateral in 10 % cases.* Its well encapsulated, extremely slow growing tumour, never turns malignant.INVESTIGATIONPeculiar feature is that it shows a hot spot in 99m - Tc -pertechnate scan.*", 'role': 'assistant'}]