This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Circulation, Subject name: Physiology
Maximum blood flow per 100 gm of tissue is in: 
Select and explain. 
A. Brain, B. Hea, C. Kidney, D. Liver
C: Kidney
Answer: C: Kidney 
Explanation: Organ Blood flow (during rest) (ml/min.) Blood flow (maximal vasodilatation) (ml/min.) Blood flow (ml) per 100 gm of tissue per min. % total cardiac output Brain 750 1500 55 14 Hea 250 1200 80 5 Liver 1300 5000 85 23 Kidneys 1200 1500 400 22 Muscle 100 20,000 3 18 Skin 200 4000 10 4 Highest amount of blood flow (ml/min): Liver Highest amount of blood flow (ml/100 gm of tissue/min.): Kidneys. However, carotid body receives 2000 ml/100 gm of tissue/min., highest for any tissue in the body. Highest aerio-venous O2 difference is seen in the hea; it is least in the kidneys.