This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Salivary Glands, Subject name: Pathology
[{'content': 'Most common primary malignant tumour of parotid gland \nSelect and explain. \nA. Wahin tumour, B. Mucoepidermoid Cancer, C. Acinic cell Cancer, D. Adenoidcystic carcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: - Most common primary malignant tumor of parotid gland is Mucoepidermoid carcinoma - Mucoepidermoid carcinoma Malignant neoplasm of variable biological aggressiveness Composed of a mixture of squamous, mucous secreting & intermediate cells.', 'role': 'assistant'}]