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: ENT
[{'content': 'Which of the following is not an indication of radiotherapy in pleomophic adenoma of parotid: \nSelect and explain. \nA. Involvement of deep lobe, B. 2nd histologically benign recurrence, C. Microscopically positive margins, D. Malignant transformation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Radiotherapy is indicated for malignant recurrence, not for benign recurrence. Indications of Radiotherapy in Salivary Gland Tumor Low-grade neoplasm with close or positive margin Facial nerve involvement Multiple regional node metastasis High-grade histology Deep lobe involvement Perineural invasion Recurrence of malignant tumors.', 'role': 'assistant'}]