An example of an activational effect of the hormone estradiol is

A) growth of the uterine lining during the menstrual cycle.
B) maturation of the ovaries.
C) differentiation of the Wolffian system into the fimbriae, Fallopian tubes, uterus, and vagina.
D) growth of auxiliary hair in females.
E) alteration of the vocal cords to create a "deep" voice.

Answer: A
Rationale: An example of an activational effect of the hormone estradiol is growth of the uterine lining during the menstrual cycle.