This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
A 24 year old female with multiple sex paners presented with vaginal discharge which is thin and white with fishy odor. Whiff test is positive which indicates the infection with which of the following organism? 
Select and explain. 
A. TORCH, B. HIV, C. Bacterial vaginosis, D. Bih anoxia
C: Bacterial vaginosis
Answer: C: Bacterial vaginosis 
Explanation: Whiff test is positive for bacterial vaginosis. It involves the production of a fishy odor when mixing vaginal fluid with 10% potassium hydroxide. Amstel criteria for diagnosing BV: Three of the following four must be present. Thin, homogenous vaginal discharge A positive whiff test Vaginal fluid pH greater than 4.5 Presence of clue cells (epithelial cells covered with bacteria) on microscopic examination Ref: Rosen T. (2012). Chapter 205. Gonorrhea, Mycoplasma, and Vaginosis. In L.A. Goldsmith, S.I. Katz, B.A. Gilchrest, A.S. Paller, D.J. Leffell, N.A. Dallas (Eds), Fitzpatrick's Dermatology in General Medicine, 8e.