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
A known HIV infected patient presents with a non-tender parotid gland swelling. The most likely diagnosis is: 
Select and explain. 
A. B-cell non-Hodgkin's lymphoma, B. Lymphoepithelial cysts, C. Sialectasia, D. Parotid abscess
B: Lymphoepithelial cysts
Answer: B: Lymphoepithelial cysts 
Explanation: 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.