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
Cardiac output can be determined by all except 
Select and explain. 
A. Fick’s principle, B. V/Q ratio, C. Thermodilution, D. Echocardiography
B: V/Q ratio
Answer: B: V/Q ratio 
Explanation: None