This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
[{'content': 'Direct Fick method of measuring cardiac output requires estimation of \nSelect and explain. \nA. O2 content of aerial blood, B. O2 content of venous blood, C. O2 consumption per unit time, D. All of the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: Applying Fick&;s principle Output of left ventricle =Cardiac output= O2 consumption (mL/min)/ - Therefore this method requires the following valuesO2 consumption per unit time=Aerial O2 content =Venous o2 contentRef: Ganong's Review of Medical Physiology Twenty-Third Edition Page No:513", 'role': 'assistant'}]