This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2019, Subject name: Physiology
[{'content': 'In a measurement of cardiac output using the fick principle, the O2 concentrations of mixed venous and aerial blood are 16 and 20 ml. 100 ml-1, respectively and the O2 consumption is 300 ml-min-1. The Cardiac output in liters min-1 is: \nSelect and explain. \nA. 5, B. 8, C. 9, D. 7.5', 'role': 'user'}, {'content': "Answer: D \nExplanation: - Oxygen level in aerial blood is given as 20ml / 100ml of blood. - Oxygen level in venous blood is given as 16ml / 100ml of blood. - O2 consumption = 300 ml / min - for entire blood volume (i.e given in liters)- By Fick's formula,", 'role': 'assistant'}]