The correct answer is Option (3) → GnRH (Gonadotropin-Releasing Hormone)
Explanation:
- GnRH is secreted by the hypothalamus and stimulates the pituitary gland to release FSH (Follicle-Stimulating Hormone) and LH (Luteinizing Hormone). LH acts at the Leydig cells and stimulates synthesis and secretion of androgens. Androgens, in turn, stimulate the process of spermatogenesis.
- Insulin is secreted by the pancreas.
- TSH (Thyroid-Stimulating Hormone) is secreted by the anterior pituitary.
- Estrogen is mainly secreted by the ovaries.
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