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 21-year-old girl is having vaginal discharge one week after unprotected sexual intercourse. The smear of vaginal discharge is shown below. All are diagnostic criteria for the condition shown except: 
Select and explain. 
A. Vaginal pH<4.5, B. Positive whiff test, C. Clue cells >20% of cells, D. Presence of more Gardnerella with few lactobacillus
A: Vaginal pH<4.5
Answer: A: Vaginal pH<4.5 
Explanation: Ans. A. Vaginal pH<4.5The image shows vaginal epithelial cells covered with coccobacilli, leading to stippled appearance of the cell. This appearance is called Clue cell and is diagnostic of bacterial vaginosis.