What is the primary function of gonadotropin‑releasing hormone (GnRH)?

• A. Stimulating pituitary secretion of luteinizing hormone and follicle-stimulating hormone
• B. Stimulating the testes and ovaries to directly produce gametes
• C. Increasing testosterone and estrogen secretion independently of pituitary hormones
• D. Suppressing pituitary gonadotropin release through negative feedback

Answer: (A)