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
Which among the following is the commonest type of parotid tumor? 
Select and explain. 
A. Pleomorphic tumor, B. Wahin's tumor, C. Adenoid cystic Ca, D. Secondaries
A: Pleomorphic tumor
Answer: A: Pleomorphic tumor 
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. It presents as an isolated swelling or mass in the submandibular gland with little associated pain. Ref: Butt F.Y. (2012). Chapter 18. Benign Diseases of the Salivary Glands. In A.K. Lalwani (Ed), CURRENT Diagnosis & Treatment in Otolaryngology--Head & Neck Surgery, 3e.