Detailed Instructions: 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'.
Problem:Question: The aminotransferases: 
 Options:  <1> They participate only in the synthesis of amino acids. <2> They participate only in the degradation of amino acids. <3> They participate in the synthesis and degradation of amino acids. <4> Your heart levels are very low. <5> None of the previous answers is true.
Solution:
3