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': 'O2 consumption by the myocardium is in mL/100 g/min is: \nSelect and explain. \nA. 2, B. 10, C. 100, D. 150', 'role': 'user'}, {'content': "Answer: A \nExplanation: Basal O2 consumption by the myocardium is about 2 mL/100 g/min. O2 consumption by the beating hea is about 9 mL/100 g/min at rest. O2 consumption by the hea is determined primarily by the intramyocardial tension, the contractile state of the myocardium, and the hea rate. Ref: Barrett K.E., Barman S.M., Boitano S., Brooks H.L. (2012). Chapter 30. The Hea as a Pump. In K.E. Barrett, S.M. Barman, S. Boitano, H.L. Brooks (Eds), Ganong's Review of Medical Physiology, 24e.", 'role': 'assistant'}]