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 vagina in pregnancy is: September 2009 
Select and explain. 
A. 4-Feb, B. 6-Apr, C. 8-Jun, D. 10-Aug
B: 6-Apr
Answer: B: 6-Apr 
Explanation: Ans. B: 4- 6 Vaginal walls becomes hyperophied and more vascular.Increased blood supply of the venous plexus surrounding the walls gives the bluish colouration of the mucosa (Jacquemier's sign) Vaginal secretion becomes copious, thin and curdy white, due to marked exfoliated cells and bacteria. The pH becomes acidic (3.5-6) due to more conversion of glycogen into lactic acid by the lactobacillus.