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
Vaginal defence is lost in: 
Select and explain. 
A. Within 10 days of birth, B. After 10 days of birth, C. During pregnancy, D. At puberty
B: After 10 days of birth
Answer: B: After 10 days of birth 
Explanation: Vaginal defence is lost at 10 days after birth. The maternal estrogen circulating the newborn maintains the vaginal defence for 10 days.
Thereafter it is lost up to pre-puberty and after menopause. High level of circulating estrogen increase the vaginal defence during puberty, pregnancy and in premenstrual phase.