Erythropoietin is inhibited by: (A) Estrogen, (B) Progesterone, (C) Thyroxine, (D) Testosterone
Answer is A. Glycoprotein hormone that controls erythropoiesis, or red blood cell production. Estrogen inhibits the erythropoietin whereas testosterone stimuates production . Ref: Ganong's Review of Medical Physiology; 24th edition; page no: 709