The medication known as mifepristone, or RU-486, acts by
A. preventing an egg from maturing and being released-essentially a stronger regular birth control pill.
B. killing sperm as they enter the female reproductive tract.
C. destroying the embryo which in turn causes a spontaneous miscarriage.
D. blocking the progesterone receptors of cells in the uterine lining and causes the loss of an implanted embryo.
E. preventing development of a uterine lining.
Answer: D
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