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: Which of the following compounds provides nitrogen atoms to the purine and pyrimidine rings? 
 Options:  <1> Aspartate <2> Carbamoyl phosphate. <3> Carbon dioxide. <4> Glutamine <5> Tetrahydrofolate.
