Gynaecology & Obstetrics Reproductive physiology and hormones in females a9c5de5d The normal bacterial flora in vagina makes it : A Acidic B Alkaline C Neutral D Does not affect High-Yield 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.