This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Heart, Circulation, and Blood, Subject name: Physiology
[{'content': "Cardiac output is measured by all EXCEPT? \nSelect and explain. \nA. Doppler, B. Oscillometry, C. Thermo-dilution method, D. Fick's principle", 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. B OscillometryRef: Ganong, 25th ed. pg. 543DopplerBased on acoustics of sound wavesThermodilution methodCold Saline is injected into right atrium and temperature change in blood is recorded in pulmonary artery. The temperature change in pulmonary artery shall be inversely related to blood flow.Pick's principleAmount of substance taken up by an organ is equal to arterial level of substance minus the venous level of substance times the blood flow.", 'role': 'assistant'}]