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: Pathology
[{'content': 'Commonest salivary gland tumour in children \nSelect and explain. \nA. Lymphoma, B. Pleomorphic adenoma, C. Adenoid cystic carcinoma, D. Mucoepidermoid carcinoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]