This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Renal physiology, Subject name: Physiology
[{'content': 'Erythropoietin is inhibited by \nSelect and explain. \nA. Estrogen, B. Progesterone, C. Thyroxine, D. Testosterone', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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", 'role': 'assistant'}]