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
pH of the vagina is lowest during : 
Select and explain. 
A. Ovulation, B. Menstruation, C. Pregnancy, D. Puerperium
C: Pregnancy
Answer: C: Pregnancy 
Explanation: Pregnancy