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': 'Maximum blood flow in ml/kg/min is: \nSelect and explain. \nA. Kidney, B. Hea, C. Brain, D. Adrenal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Kidney', 'role': 'assistant'}]