question: Q:A 24-year-old woman comes to her primary care physician because she has not had a menstrual period for 6 months. She is a competitive runner and has been training heavily for the past year in preparation for upcoming races. She has no family or personal history of serious illness. She has not been sexually active for the past 9 months. Her temperature is 36.9°C (98.4° F), pulse is 51/min, respirations are 12/min, and blood pressure is 106/67 mm Hg. Her BMI is 18.1 kg/m2. Which of the following is the most likely cause of her amenorrhea?? 
  {'A': 'Poor synthetic response of ovarian cells to circulating LH and FSH', 'B': 'Increased prolactin secretion', 'C': 'Decreased frequency of GnRH release from the hypothalamus', 'D': 'Intrauterine adhesions', 'E': 'Increased LH release and increased ovarian androgen production'},