____ stimulates the interstitial cells of the testes to secrete
a. Gonadotropin-releasing hormone (GnRH); LH
b. Follicle-stimulating hormone (FSH); androgen-binding protein (ABP)
c. Luteinizing hormone (LH); androgen-binding protein (ABP)
d. Luteinizing hormone (LH); testosterone
e. Luteinizing hormone (LH); estrogen