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: Surgery
[{'content': 'Mixed parotid tumour arises from - \nSelect and explain. \nA. Epithelium, B. Epithelium + Mesenchymal, C. Mesenchymal, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]