The correct option is C Pituitary gland
The pituitary gland is the master gland located in the brain, where the gonadotropin-releasing hormone (GnRH) is secreted. This hormone further stimulates the secretion of sex hormones, that is, estrogen and testosterone from ovaries and testes in female and male bodies, respectively. Hence, pituitary gland is the master gland that controls the secretion of sex hormones.