Mifepristone,often Called RU-486,is a Drug That Can Be Taken to Prevent

Mifepristone,often called RU-486,is a drug that can be taken to prevent a pregnancy after unprotected sex.This drug blocks progesterone receptors.Therefore,its most direct mode of action to prevent pregnancy is to

A) prevent the secretion of estrogen.
B) prevent the thickened endometrium from being maintained.
C) induce the secretion of LH from the corpus luteum.
D) induce a sudden increase in the secretion of FSH from the anterior pituitary.
E) prevent secretion of progesterone from the corpus luteum.