<prompt> Erythropoietin production is inhibited by ?EstrogenProgesteroneThyroxineTestosterone  <response>: Ans. is a i.e., EstrogenThe most impoant stimulus for erythropoietin secretion is hypoxia.Other stimulus that can increase its secretion are cobalt salts, androgens, alkalosis due to high altitude, and catecholamines beta-adrenergic mechanism. 