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
[{'content': 'The normal bacterial flora in vagina makes it : \nSelect and explain. \nA. Acidic, B. Alkaline, C. Neutral, D. Does not affect', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]