स्त्रियांमध्ये स्त्रीबीज आणि फॉलिकल तयार होण्याच्या प्रक्रियेचा अंतिम टप्पा _____ रसायनाने नियंत्रित केला जातो.

The correct answer is Option A (human chorionic gonadotropin).

Key Points:
• Reproductive Endocrinology and Assisted Reproductive Technology (ART):
• In clinical reproductive biotechnology and in-vitro fertilization (IVF), the final maturation of the preovulatory ovarian follicle and primary oocyte requires precise hormonal regulation.
• Role of Human Chorionic Gonadotropin (hCG):
• Because human chorionic gonadotropin (hCG) shares structural homology and receptor affinity with Luteinizing Hormone (LH), clinicians administer an exogenous "hCG trigger".
• This surge simulates the natural pre-ovulatory LH peak, inducing the resumption of meiosis I, extrusion of the first polar body, and final maturation of the Graafian follicle and oocyte immediately prior to follicular rupture.
• Adrenaline governs fight-or-flight responses, oxytocin drives uterine contractions, and thyroxine modulates basal metabolic rate.
• Therefore, Option 1 (human chorionic gonadotropin) is the designated hormone controlling this terminal maturation step.
• Key Takeaway: Human chorionic gonadotropin (hCG) triggers the final maturation stage of the ovarian follicle and oocyte in reproductive biotechnology.