The endocrine cells of testes present in the space between seminiferous tubules are termed as interstitial cells or interstitial cells of Laydig. They serve to secrete androgen, testosterone, which is responsible for development of male secondary sexual characters. Adrenal gland secretes glucocorticoids, mineralocorticoids, sex hormones (by adrenal cortex) and epinephrine and norepinephrine (by adrenal medulla). The placenta is the structure formed between chorion and uterine tissue. it secretes human chorionic gonadotropin that maintains the corpus luteum. Ovaries are the female reproductive organs that secrete estrogen and progesterone; the female sex hormones. The epithelial lining of lobules of thymus secretes thymosins that serve as growth hormone. Parathyroid gland secretes the parathyroid hormone that reduces the blood phosphate level while increasing the blood calcium level. Thus, the correct answer is B.