This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral Cavity, Subject name: ENT
[{'content': "A known HIV infected patient presents with a non-tender parotid gland swelling. The most likely diagnosis is: \nSelect and explain. \nA. B-cell non-Hodgkin's lymphoma, B. Lymphoepithelial cysts, C. Sialectasia, D. Parotid abscess", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Benign lymphoepithelial cysts may develop in the parotid glands on one or both sides. They arise from intraparotid lymph nodes. Diagnosis is confirmed on CT scan and fine-needle aspiration cytology.', 'role': 'assistant'}]