This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infections of the genital tract, Subject name: Gynaecology & Obstetrics
Regarding bacterial vaginosis, all are true except : 
Select and explain. 
A. Homogeneous vaginal discharge with pH 5.0 to 6.0, B. Positive KOH - With fishy odour, C. Positive clue cells in 100% of cases, D. It is due to Gardnerella vaginalis
C: Positive clue cells in 100% of cases
Answer: C: Positive clue cells in 100% of cases 
Explanation: Amsel's four diagnostic criteria homogeneous vaginal discharge vaginal PH >4.5 positive whiff's test presence of clue cells >20% of cells D.C.DUTTAS TEXTBOOK OF GYNAECOLOGY,PG NO:152,6TH EDITION