GnRH acts on which of the following?
Laydig cells
Sertoli cells
Posterior pituitary
Anterior pituitary
spermatogenesis begins at puberty when the GnRH hormones level rises and stimulates anterior pituitary to secrete two gonadotrophin hormones LH and FSH, thereby inducing spermatogenesis.
lh and fsh are the gonadotrophin hormones secreted by anterior pituitary stimulated by GnRH hormone.
Hence option D is correct.