Answer : The correct option is, Gram.
Explanation :
S.I : It is known as the international System of Units. It is defined as a scientific method to express the magnitude of the several basics units.
As we know that there are seven basic units in the system from which the other units are derived.
The seven base unit are, meter used for length, kilogram used for mass, second used for time, ampere used for current, kelvin used for temperature, mole used for amount of substance and candela used for intensity.
As per question, pint, quart and gallon are the units of volume and they are not the part of the S.I system. While, the gram is the part of the S.I system.
Hence, the correct option is, Gram.