You will be given a definition of a task first, then some input of the task.
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'.

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.
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
1