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
Hormones secreted by kidney 
Select and explain. 
A. Erythropoietin, B. Aldosterone, C. Vasopressin, D. Angiotensin
A: Erythropoietin
Answer: A: Erythropoietin 
Explanation: The kidneys produce three hormones: 1,25-dihydroxycholecalciferol, renin, and erythropoietin.Ref: Ganong&;s Review of Medical Physiology, 23rd edition, page no: 670