Question

Which of these acids occurs naturally in the body and performs important regulatory functions?



carbonic acid

acetic acid

magnesium hydroxide

sodium hydroxide

Answer 1

only two of the choices are acids, so that narrows things down, doesn't it?

Answer 2

consider carbonic acid, H2CO3.
in the lungs, CO2 is dissolved in the water along the walls of the lungs.
the solution is actually H2CO3
The dissolution of H2CO3 facilitates the excretion of CO2 from the body.