Which hormone has only one known effect: to stimulate milk production by the breasts?
A) progesterone
B) prolactin
C) estrogen
D) oxytocin

Question

Quizplus · Accepted Answer

Prolactin is the hormone that has only one known effect, which is to stimulate milk production by the breasts. Progesterone and estrogen are involved in the menstrual cycle and pregnancy, while oxytocin is involved in labor and delivery, as well as milk letdown during breastfeeding.

Which Hormone Has Only One Known Effect: to Stimulate Milk