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': 'Angiotensinogen is produced by \nSelect and explain. \nA. Liver, B. Kidney, C. Hypothalamus, D. Atrium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Angiotensiogen is produced in liver and is conveed into AT1 by RAAS mechanism Ref: guyton and hall textbook of medical physiology 12 edition page number:489,490,491', 'role': 'assistant'}]