In adolescent girls, the vaginal lining varies in thickness according to the amount of _____.

A) testosterone
B) estrogen
C) oxytocin
D) somatostatin

Vaginal Lining

The inner mucous membrane layer of the vagina, which provides protection and lubrication.

Estrogen

A group of sex hormones primarily responsible for the development and regulation of the female reproductive system and secondary sexual characteristics.