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: What group of amino acids, when they are part of the proteins, can be phosphorylated? 
 Options:  <1> Val, Ser, Thr. <2> Phe, Ala, Gly. <3> Val, Glu, Asp. <4> Tyr, Ser, Thr. <5> Lys, Ser, Ile.
