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': 'Which of these pathologies is the most common benign tumour of the parotid gland? \nSelect and explain. \nA. Mumps, B. TB, C. Heerfordt syndrome, D. Pleomorphic adenoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Mumps causes the classic bilateral parotitis, but it can present as a unilateral enlargement in rare cases. Heerfordt syndrome includes sarcoidosis.\nTuberculosis historically was associated with ‘cold abscess’. It is caused by Mycobacterium tuberculosis, an acid-fast bacterium that does not stain with Gram stain. It requires Ziehl–Neelsen staining.', 'role': 'assistant'}]