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': 'True about parotid tumor:a) Pleomorphic adenoma is the most common varietyb) Malignant disease is most common varietyc) Facial nerve involvement indicates malignancyd) Superficial paroditectomy is the t/t of choice \nSelect and explain. \nA. abc, B. acd, C. bc, D. bde', 'role': 'user'}, {'content': 'Answer: B \nExplanation: In parotid tumors, rapid growth, pain, paraesthesia, enlarged cervical LN and restriction of jaw movements, facial weakness or skin invasion and fixation of mastoid tip is suggestive of malignant transformation.', 'role': 'assistant'}]