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
[{'content': '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: \nSelect and explain. \nA. Vaginal pH<4.5, B. Positive whiff test, C. Clue cells >20% of cells, D. Presence of more Gardnerella with few lactobacillus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]