Follicle stimulating hormone (FSH) is secreted by anterior pituitary gland. It promotes spermatogenesis in seminiferous tubules of male and follicle development in females. This makes option D correct. Option B is incorrect as posterior pituitary gland does not secrete any hormone; vasopressin and oxytocin are produced by hypothalamus but stored and released in to blood stream via posterior pituitary. Gonads (testes and ovaries) serve as endocrine organs and secrete androgens and estrogen and progesterone respectively. This makes option A incorrect. Thyroxine and triiodothyronine are thyroid hormones which target all tissues and stimulate metabolic rate, growth and development. This makes option C incorrect. Correct answer is D.