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 of the following statement regarding mixed tumors of the salivary glands, is true? 
Select and explain. 
A. It is usually malignant, B. It is associated with calculi, C. It is most common in parotid gland, D. It is most common in submandibular gland
C: It is most common in parotid gland
Answer: C: It is most common in parotid gland 
Explanation: Pleomorphic adenoma or mixed tumor of salivary gland is the most common salivary gland tumor accounting for 70% of all salivary gland tumors. 80% of these are located in the parotid gland and presents as a firm, slow-growing mass. Ref: CURRENT Diagnosis and Treatment in Otolaryngology Head and Neck Surgery, 3rd Edition, Chapter 18; Essentials of Anatomic Pathology By Liang Cheng, 2nd Edition, Page 764; Harrison's Principles of Internal Medicine, 18th Edition, Chapter 32.