C. Pituitary gland.
The pituitary gland is responsible for the release of follicle-stimulating hormone and leutinizing hormone. Follicle-stimulating is important in the follicular phase of the menstrual cycle, as it stimulates the development of ovarian follicles. Leutinizing hormone is important in the initiation of ovulation and in the stimulation of the corpus luteum to produce progesterone.