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
Which is the COMMONEST parotid tumor? 
Select and explain. 
A. Pleomorphic adenoma, B. Monomorphic adenoma, C. Wahin's tumor, D. Adenocarcinoma
A: Pleomorphic adenoma
Answer: A: Pleomorphic adenoma 
Explanation: 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.