This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Salivary Glands, Subject name: Surgery
[{'content': 'Which of the following increases the risk of salivary gland tumors? \nSelect and explain. \nA. Radiotherapy to head and neck, B. Exposure to silica dust, C. Early menarche and nulliparity, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: ETIOLOGY OF SALIVERY GLAND TUMORS - Radiotherapy to head and neck (for mucoepidermoid carcinoma) - EBV infection (for lymphoepithelial carcinoma) - Exposure to silica, dust, nitrosamines - Increased risk in females with early menarche and nulliparity - Trisomy 5 in primary mucoepidermoid carcinoma of minor salivary glands. - Polysomy of 3 and 17 especially in adenoid cystic carcinoma.', 'role': 'assistant'}]