Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: The atomic mass of carbon is: 
 Options:  <1> The mass of 6.02.1023 carbon atoms, all of them being from the 12C isotope. <2> The mass of 6,022,103 carbon atoms, averaged according to the natural abundance of its isotopes. <3> The twelfth part of the mass of a carbon atom of the 12C isotope. <4> The sum of the mass of 6 protons, 6 neutrons and 6 electrons. <5> The mass of 12 protons.
