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: Pathology
[{'content': 'True about salivary gland tumour is: \nSelect and explain. \nA. MEC shows perineural spread and requires wide resection, B. ACC shows perineural spread and requires wide resection, C. MEC is well-encapsulated and does not require surgical excision, D. ACC is well-encapsulated and does not require surgical excision', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Treatment and Prognosis \nThe treatment of mucoepidermoid carcinoma is predicated by the location, histopathologic grade, and clinical stage of the tumor. Early-stage tumors of the parotid often can be treated by subtotal parotidectomy with preservation of the facial nerve. Advanced tumors may necessitate total removal\xa0of the parotid gland,\xa0with sacrifice of the facial nerve. Submandibular gland\xa0tumors are\xa0treated by\xa0assured surgical excision. For low-grade neoplasms, only a modest margin of surrounding normal tissue may need to be removed, but high-grade or tumors warrant wider resection, similar to that required for squamous cell carcinomas. If\xa0there is underlying bone destruction, then the involved bone\xa0must be excised.\xa0\n\xa0\nAdenoid cystic carcinoma is a relentless tumor that is prone to local recurrence and eventual distant metastasis. Surgical resection is usually the treatment of choice. Adjuvant radiation therapy may slightly improve patient survival in some cases, although recent SEER data suggest that radiation therapy does little to improve prognosis overall. Because metastasis to regional lymph nodes is uncommon (6% to 10% of cases), neck dissection usually is not indicated.\xa0\nRef: Oral pathology Neville, 4th ed page no 457, 463', 'role': 'assistant'}]