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'.

[EX Q]: 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.
[EX A]: 4

[EX Q]: Question: In an evaluation the redox indicator In (ox) + ne-  In (network) is used, whose normal potential is E0. The color change will occur: 
 Options:  <1> To the potential of the equivalence point. <2> To the value of E0. <3> In the interval E0  0.059 / n. <4> In the interval E0 (ox) - E0 (network) if it is evaluated with a reducer. <5> At the potential of 0.059 / n.
[EX A]: 3

[EX Q]: Question: What specific procedure of the experimental strategy makes it the most appropriate to test hypotheses of causality? : 
 Options:  <1> The representative sampling of the participants. <2> The manipulation of the independent variable with control of possible strange variables. <3> The realization of the study in real contexts with natural groups. <4> The identification of possible predictor variables through the retrospective analysis of the study phenomenon. <5> The application of statistical techniques for the analysis of data.
[EX A]:
2