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
"Clue" cells are found in: 
Select and explain. 
A. Bacterial vaginosis, B. Chlamydia trachomatis, C. Neisseria gonorrhoea, D. Trichomonas
A: Bacterial vaginosis
Answer: A: Bacterial vaginosis 
Explanation: Bacterial vaginosis