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
Coronary blood flow (Right ventricle), true is: 
Select and explain. 
A. 500 mL/min, B. Maximum during systole, C. Adenosine decreases it, D. More than skin
B: Maximum during systole
Answer: B: Maximum during systole 
Explanation: Although maximum blood flow occurs during diastole in left ventricle, in right ventricle it is maximum during systole. 
Because diastole is shorter when the heart rate is high, left  ventricular  coronary flow is reduced during tachycardia. On the other hand, the pressure differential between the aorta and the right ventricle, and the differential between the aorta and the atria, are somewhat greater during systole than during diastole. Consequently, coronary flow in those parts of the heart is not appreciably reduced during systole. Flow in the right and left coronary arteries is shown in figure.