Why Does a Breathalyzer Accurately Measure Alcohol Concentration in Blood

Why does a breathalyzer accurately measure alcohol concentration in blood?

A) Due to zero-order kinetics, but only for light or moderate alcohol use.
B) Exactly 5% of alcohol is eliminated from the lungs and the ratio to blood is known.
C) The exact concentration of alcohol needed to saturate alcohol dehydronase enzymes is known.
D) Alcohol users typically smoke tobacco while drinking, and the nicotine elimination rate is known.

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