<prompt> Progestreone has how many carbons -18192120  <response>: Ans. is c i.e., 21 o Steroid hormones are of 3 types :-21-carbon steroids C21 - Progesterone, corticosteroids glucocorticoids, mineralocorticoids.19-carbon steroids C19 - Androgens testosterone.18-carbon steroids C18 - Estrogens. 