This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Reproductive physiology and hormones in females, Subject name: Gynaecology & Obstetrics
The normal bacterial flora in vagina makes it : 
Select and explain. 
A. Acidic, B. Alkaline, C. Neutral, D. Does not affect
A: Acidic
Answer: A: Acidic 
Explanation: The vaginal secretion is acidic due to the presence of lactic acid pH is 4.5 It is secreted by the bacteria in the vagina Ref: Shaw Gynecology 17 e pg 16.