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
[{'content': 'Regarding bacterial vaginosis, all are true except : \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': "Answer: C \nExplanation: 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", 'role': 'assistant'}]