This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glomerular Filtration, Renal Blood Flow, and Their Control, Subject name: Physiology
[{'content': 'Renal blood flow contributes what % of the cardiac output? \nSelect and explain. \nA. 15%, B. 25%, C. 45%, D. 50%', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref: W F Ganong. Circulation Through Special Regions. In: Review of Medical Physiology. 21st ed. California: McGraw-Hill Companies; 2003 p 603.Explanation: (See the following table)', 'role': 'assistant'}]