question: Q:A 27-year-old woman comes to the physician for the evaluation of infertility. She has been unable to conceive for the past 2 years. Menses occur at 45 to 80-day intervals. She is 168 cm (5 ft 6 in) tall and weighs 77 kg (170 lb); BMI is 27.4 kg/m2. Physical examination shows facial acne and pigmented hair on the upper lip. Serum studies show elevated levels of testosterone and an LH:FSH ratio of 4:1. Treatment with the appropriate drug for this patient's infertility is begun. Which of the following is the primary mechanism of action of this drug?? 
  {'A': 'Activation of pituitary dopamine receptors', 'B': 'Inhibition of endometrial progesterone receptors', 'C': 'Activation of ovarian luteinizing hormone receptors', 'D': 'Activation of granulosa cell aromatase', 'E': 'Inhibition of hypothalamic estrogen receptors'},