Oral contraceptives stop ovulation by causing the pituitary to stop secreting:
A. androgens
B. prolactin (Prl)
C. follicle-stimulating hormone (FSH)
D. luteinizing hormone (LH)
c
Rationale: Oral contraceptives provide negative feedback to the hypothalamus and inhibit gonadotropin-releasing hor-mone. Therefore, the pituitary does not secrete FSH to stimulate ovulation.
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