The right answer is B. Testicles
Control of testicular activity is performed by the hypothalamic-pituitary complex (or gonadotropic axis): the hypothalamus is an area at the base of the brain that contains clusters of neurons secreting hormones. It is attached to the pituitary gland via the pituitary stem. These neurons rhythmically emit flashes of action potentials. This activity triggers the pulsatile secretion of gonadotropin-releasing-hormone, or GnRH, a hypothalamic neurohormone.
Testicles are directly affected by pituitary hormones.
Pituitary glands secrete a variety of hormones and control reproduction, metabolism, blood pressure, growth and many other body functions.
Testicles are the male reproductive gland and are responsible for producing the sperm, the male gametes. The activity of the male reproductive gland testis is regulated by the Pituitary gland.
The secretion from this gland and hypothalamus controls and regulates the male gamete and hormone formation.
The secretion from the Pituitary gland like a hypothalamic neurohormone called gonadotropin-releasing-hormone, or GnRH is essential for spermatogenesis in males.
Therefore, option B is correct.
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