The mechanism of action of oral contraceptives is
A. to decrease the lumen of the fallopian tubes making fertilization more difficult.
B. to prevent fertilization from occurring by slowing the release of the ovum from the ovary.
C. to inhibit ovulation by suppressing FSH and LH levels.
D. to increase the acidity of vaginal secretions, thus acting as a spermicidal.
Answer: C
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