A 22-year-old female came with the chief complaint of significant weight loss and secondary amenorrhea. She has a high-intensity exercise regimen, is preoccupied with food, and seems to have an irrational fear of gaining weight. Decreased production of which of the following hormones leads to amenorrhea in anorexia nervosa?
Gonadotropin releasing hormone (GnRH) Progesterone Human chorionic gonadotropin (hCG) Estradiol