Physiology 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 💡 Explanation By which mechanism do LH and FSH return to baseline levels? ✓ Correct Answer: C. Negative feedback on GnRH by estradiol