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
[{'content': 'Coronary blood flow (Right ventricle), true is: \nSelect and explain. \nA. 500 mL/min, B. Maximum during systole, C. Adenosine decreases it, D. More than skin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Although maximum blood flow occurs during diastole in left ventricle, in right ventricle it is maximum during systole.\xa0\nBecause diastole is shorter when the heart rate is high, left\xa0 ventricular\xa0 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.', 'role': 'assistant'}]