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
[{'content': 'Most common major salivary gland malignancy is: \nSelect and explain. \nA. Mucoepidermoid carcinoma, B. Pleomorphic adenoma, C. Adenoid cystic carcinoma, D. Adenocarcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Mucoepidermoid carcinoma,\nPg 2497 ScottBrown Otorhinolaryngology Vol2', 'role': 'assistant'}]