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: Unknown
Mixed tumors of the salivary glands are characterized by which of the following? 
Select and explain. 
A. They occur most commonly on the lips, t09gue, and palate, B. They grow rapidly, C. They rarely recur if simply enucleated, D. They present as rock-hard masses
A: They occur most commonly on the lips, t09gue, and palate
Answer: A: They occur most commonly on the lips, t09gue, and palate 
Explanation: There are approximately 400 to 700 minor salivary glands in the oral cavity. Pleomorphic adenomas (mixed tumors) can occur in any of them. These round tumors have a rubbery consistency and are slow-growing; all are potentially malignant. Unless adequately excised, they tend to recur locally in a high percentage of cases. The sites most commonly affected by pleomorphic adenomas of the salivary glands are the lips, tongue, and palate.