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
P4 pf vagina during reproductive life is 
Select and explain. 
A. Alkaline, B. Acidic, C. Neutral, D. Variable
B: Acidic
Answer: B: Acidic 
Explanation: Vaginal secretion is acidic during reproductive life which is oestrogen dependent, and inhibits growth of pathogenic organisms.