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: The eudismic index is a parameter with pharmacological interest that expresses the relationship between: 
 Options:  <1> Two diastereomer drugs. <2> Two bioisostero drugs. <3> Two enantiomers <4> A drug and a prodrug, structural analog. <5> Two structural modifications, one hydrophilic and one lipophilic, of a certain drug.
3

Question: The target of the aminoglycoside antibacterials is the: 
 Options:  <1> DNA polymerase <2> Transpeptidation of peptidoglycan. <3> 30S subunit of the ribosome. <4> RNA polymerase <5> DNA gyrase.
3

Question: Which of the following is the central characteristic of the stage of formal operations according to Piaget ?: 
 Options:  <1> The solution of conservation problems. <2> The reversibility in thought. <3> The overcoming of egocentrism. <4> The theory of the mind <5> The hypothetical-deductive thought.

5