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: Radiology
[{'content': 'A 50 year old female patient complains of difficulty in swallowing. Patient gives h/o multiple diagnostic CT-scans of the head and neck region. The incidence of which of the following salivary gland tumor will be more likely in this patient? \nSelect and explain. \nA. Pleomorphic adenocarcinoma, B. Mucoepidermoid carcinoma, C. Adenoid cystic carcinoma, D. Acinic cell carcinoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The incidence of salivary gland tumors, both benign and malignant, is increased in patients treated with irradiation for diseases of the head and neck and in Japanese atomic bomb survivors.\n\nMost of the tumors were benign, with Warthin tumor being the most frequent.\nAmong the malignant tumors, the frequency of mucoepidermoid tumor was highest.\n\nAn association between tumors of the salivary glands and dental radiography has been shown, although this association is likely a consequence of more dental radiographs made to investigate the symptoms of an existing tumor, rather than the dental radiation doses inducing tumors.\n\xa0\nReference: White and Pharoah, Oral radiology, Ed 8th, pg-91, 92', 'role': 'assistant'}]