This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Heart, Circulation, and Blood, Subject name: Physiology
For an arterial blood content of 20 mL oxygen per 100 mL blood and venous blood content of 15 mL oxygen per 100 mL of blood, how much oxygen is transferred from blood to tissue if the blood flow is 200 mL/min? 
Select and explain. 
A. 5 mL/min, B. 10 mL/min, C. 15 mL/min, D. 20 mL/min
B: 10 mL/min
Answer: B: 10 mL/min 
Explanation: Ans. B. 10 mL/minThe amount of oxygen exchanged is equal to the product of the blood flow and the arterial venous oxygen content difference: 200mL/minx(20mL/100mL-15mL/100mL)=10mL/min.