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: Urea:
Options: <1> It is transported to the liver for elimination. <2> It is degraded to ammonium in the urea cycle. <3> It is apolar and easily forms crystals. <4> It is obtained from arginine. <5> It has two ketone groups and one amino group.
Output:
4