Which Statement Regarding Emergency Contraception Is Correct

Multiple Choice

Which statement regarding emergency contraception is correct?

A) Emergency contraception requires that the first dose be taken within 72 hours of unprotected intercourse.
B) Emergency contraception may be taken right after ovulation.
C) Emergency contraception has an effectiveness rate in preventing pregnancy of approximately 50%.
D) Emergency contraception is commonly associated with the side effect of menorrhagia.