This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System Pa 2, Subject name: Physiology
[{'content': 'Under resting conditions, total body oxygen consumption is: \nSelect and explain. \nA. 100 ml. /min., B. 150 ml./min., C. 200 ml./min, D. 250 ml./min.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Every 100 mL of aerial blood carries approx. 20 mL of oxygen. Of this 20 mL, tissues extract (and utilize) 5 mL, under resting conditions of metabolism. Considering the normal cardiac output (under resting conditions) to be 5 L/min, 250 mL of oxygen will be extracted by the entire body. (5 mL from every 100 mL of blood; 250 mL from 5 L of blood.)', 'role': 'assistant'}]