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
Renal blood flow contributes what % of the cardiac output? 
Select and explain. 
A. 15%, B. 25%, C. 45%, D. 50%
B: 25%
Answer: B: 25% 
Explanation: 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)