GnRH, a hypothalamic hormone, needed in reproduction acts on
A. anterior pituitary gland and stimulates secretion of LH and FSH
B. posterior pituitary gland and stimulates secretion of oxytocin and FSH
C. posterior pituitary gland and stimulates secretionf of LH and relaxin
D. anterior pituitary gland and stimulates secretion of LH and oxytocin