This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Amount of coronary flow per minute is: 
Select and explain. 
A. 225 mL, B. 250 mL, C. 50 mL, D. 300 mL
B: 250 mL
Answer: B: 250 mL 
Explanation: Coronary flow at rest in humans is about 250 mL/min (5% of the cardiac output).