Relative atomic mass is the mass of an atom of an element as compared to the mass of _____?

Relative atomic mass is the mass of an atom of an element as compared to the mass of _____?

کس کے بڑے پیمانے کے مقابلے میں کسی عنصر کے ایٹم کا بڑے پیمانے پر متعلقہ جوہری ماس ہے؟
Explanation

Relative atomic mass is measured by comparing an atom's mass to 1/12th the mass of a carbon-12 atom.

Carbon-12 is the standard reference in modern atomic mass scale.