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
Renal blood flow contributes to what % of the cardiac output? 
Select and explain. 
A. 15%, B. 25%, C. 45%, D. 50%
B: 25%
Answer: B: 25% 
Explanation: In a resting adult, the kidneys receive 1.2 to 1.3 L of blood per minute or just under 25% of the cardiac outputRef: Ganong&;s Review of Medical Physiology, 23rd edition, page no: 643