This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
[{'content': 'Kidney secretes: March 2013 \nSelect and explain. \nA. Erythropoietin, B. Angiotensin I, C. Angiotensin II, D. Thrombodulin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. Erythropoietin', 'role': 'assistant'}]