By which mechanism do LH and FSH return to baseline levels?: (A) LH surge, (B) Negative feedback on gonadotropin-releasing hormone (GnRH) by progesterone, (C) Negative feedback on GnRH by estradiol, (D) Negative feedback on GnRH from testosterone
Answer is C. Just after the LH surge, estradiol levels increase, which causes negative feedback on GnRH to stop producing LH and FSH, resulting in the decrease in their levels