The cardiac output can be determined by all except: (A) Fick's principle, (B) V/Q ratio, (C) Echocardiography, (D) Thermodilution
Answer is B. Methods to determine the Cardiac output

Flowmeter
Cardiometer

-        Indirect method- Used in humans

Fick’s principle method
Indicator dilution method
Thermodilution method
Doppler echocardiography
Cineradiography