Which of the following is NOT a way in which alcohol is excreted from the body unchanged?

The correct response indicates that stool is not a way in which alcohol is excreted from the body in its unchanged form. Alcohol primarily undergoes metabolization in the liver, where it is converted into various metabolites. While a very small percentage of alcohol is excreted unchanged through breath, urine, and sweat, the primary means of excretion involves transformation into different substances.

Breath excretion primarily occurs because alcohol can be evaporated in the lungs, allowing it to be expelled as vapor. Urine excretion involves the kidneys filtering the blood, where alcohol and its metabolites can be found, although in smaller amounts of unchanged alcohol. Sweat also allows for the excretion of minor amounts of alcohol, which can be detected in perspiration.

In contrast, stool is a byproduct of the digestive system that primarily contains undigested food and waste but does not typically contain alcohol that has not been metabolized. Thus, this makes it the correct answer.