Choose the odd one out from each series

(a) The glands - thyroid, adrenal, pituitary, prostate...........................

(b) The conditions - cretinism, myxoedema, goitre, scurvy....................

(c) The hormones - insulin, glucagon, cretinism, thyroxine......................

(d) The hormonal sources - adrenal cortex, adrenal medulla, cortisone, pituitary...............................