This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lab Investigations, Subject name: Microbiology
[{'content': 'All are true about Bacterial vaginosis except \nSelect and explain. \nA. Vaginal pH <4.5, B. Nugent scoring can be used for diagnosis, C. Fishy smelling discharge after addition of KOH, D. Presence of clue cells is pathognomic', 'role': 'user'}, {'content': "Answer: A \nExplanation: Amsel's criteria is used for diagnosis of bacterial vaginosis although Nugent scoring can also be used Amsel's criteria Vaginal pH> 4.5 Discharge when put in 10 % KOH produces fishy smell Clue cells are seen Clue cells are vaginal squamous epithelial cells coated with Gardnerella vaginalis", 'role': 'assistant'}]