This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Salivary Gland, Subject name: Surgery
A businessman notices a lump in front of his ear while shaving one morning. His wife thinks it has been there for several months. What is the most likely cause of a mass in the parotid gland in this patient? SELECT ONE. 
Select and explain. 
A. Lymphoma, B. Squamous cell carcinoma, C. Metastatic skin cancer, D. Benign mixed tumor
D: Benign mixed tumor
Answer: D: Benign mixed tumor 
Explanation: Benign mixed tumor (pleomorphic adenoma) requires appropriate excision (superficial parotidectomy). If the tumor is shelled out, recurrence is likely. Approximately 80% of tumors of the salivary glands occur in the parotid gland.