Which of the following statements about oral contraceptives is TRUE?
A)They are effective only because they prevent ovulation.
B)Full protection is provided by oral contraceptives after three days of use.
C)The most common type of oral contraceptive contains both estrogen and progesterone.
D)A significant risk of pregnancy exists even if oral contraceptives are taken as directed.

Question

Quizplus · Accepted Answer

The most common type of oral contraceptive contains both estrogen and progesterone. Other types that contain only progesterone are also available. Option A is partially true, as it is one of the mechanisms of action, but they also thicken cervical mucus and change the lining of the uterus, making it less receptive to implantation. Option B is incorrect, as it takes seven days of continuous use to achieve full protection. Option D is incorrect, as if used correctly, the chance of pregnancy is less than 1%.

Which of the Following Statements About Oral Contraceptives Is TRUE