Select the Incorrect Statement About Oral Contraception

Select the incorrect statement about oral contraception.

A) Oral contraceptives prevent ovulation.
B) Oral contraceptives (if taken strictly according to directions) have a failure rate of between 1 and 5 percent.
C) Oral contraceptives contain analogues of progesterone and sometimes these analogues are in combination with estrogens.
D) Oral contraceptives have been shown to reduce the risks of endometrial and ovarian cancers.
E) Oral contraceptives are safe to use by females who smoke as long as they maintain a good exercise regimE.