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: Gynaecology & Obstetrics
Regarding clue  cells all are true except 
Select and explain. 
A. Most reliable indicators of bacterial vaginosis., B. Vaginal epithelial cells contain many attached bacteria creating stippled border., C. Positive predictive value of this test is 95 percent., D. 10 percent of epithelial cells should be clue cells.
D: 10 percent of epithelial cells should be clue cells.
Answer: D: 10 percent of epithelial cells should be clue cells. 
Explanation: Atleast 20 percent of epithelial cells should be clue cells for diagnosis of bacterial vaginosis.