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: ENT
[{'content': "Which is the COMMONEST parotid tumor? \nSelect and explain. \nA. Pleomorphic adenoma, B. Monomorphic adenoma, C. Wahin's tumor, D. Adenocarcinoma", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pleomorphic adenomas, or benign mixed tumors, are the most common neoplasms of the salivary glands. They represent approximately 60-70% of all parotid tumors and 90% of submandibular benign tumors. These neoplasms affect females more than males and are commonly seen in the third to sixth decades of life. When the deep parotid lobe is involved, a pleomorphic adenoma can present as a parapharyngeal space tumor with soft palate swelling.', 'role': 'assistant'}]