This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Head and neck, Subject name: Surgery
[{'content': 'True about parotid tumor is all except \nSelect and explain. \nA. Facial nerve involvement indicates malignancy, B. Pleomorphic adenoma is MC variety, C. Malignant disease is MC Variety, D. Superficial parotidectomy is the treatment of choice', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Eight percent salivary neoplasms are in the parotids of which 80% are benign ; 80% of these are pleomorphic adenomas. Parotid tumours are common but only 20% are malignant.Facial nerve involvement -lower facial nerve palsy-(difficulty in closing eyelid,difficulty in blowing and clenching teeth) indicates malignancy.Superficial parotidectomy is done if only superficial lobe is involved. And 80% of tumours occur in superficial lobe. SRB,5th,414.', 'role': 'assistant'}]