<prompt> By which mechanism do LH and FSH return to baseline levels?LH surgeNegative feedback on gonadotropin-releasing hormone GnRH by progesteroneNegative feedback on GnRH by estradiolNegative feedback on GnRH from testosterone  <response>: 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 