This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Obs), Subject name: Gynaecology & Obstetrics
A female aged 20 presented with vaginal discharge which is non irritating and malodorous. Saline wet preparation reveals clue cells. Which type of vaginitis Clue cells are used to detect? 
Select and explain. 
A. Bacterial vaginosis, B. Candidal vaginitis, C. Primary syphilis, D. Secondary syphilis
A: Bacterial vaginosis
Answer: A: Bacterial vaginosis 
Explanation: Ans. A. Bacterial vaginosisClue cells are considered to be the most reliable indicators of BV.* The positive predictive value is of around 95% of this test for the presence of BV.* These vaginal epithelial cells contain many attached bacteria and hence create a poorly defined border of stippled cells.