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: Of the following reaction mechanisms, in which there is an inversion of the configuration from the reactant to the product of the reaction ?: 
 Options:  <1> Bimolecular nucleophilic substitution (SN2). <2> Unimolecular elimination (E1). <3> Unimolecular nucleophilic substitution (SN1). <4> Addition Markovnikov. <5> Addition anti-Markovnikov.
1

Question: The differential modification of RNA: 
 Options:  <1> It can result in multiple products from one gene. <2> It occurs thanks to the transcription bubble. <3> It is catalyzed by RNA polymerase I. <4> It is catalyzed by RNA polymerase II. <5> It is catalyzed by RNA polymerase III.
1

Question: What do behavioral treatments for major depressive disorder have in common? 
 Options:  <1> The use of exposure techniques to stressful situations. <2> The main objective of modifying maladaptive beliefs and assumptions that make a person vulnerable to depression. <3> Which are unstructured therapies and without a limited number of sessions. <4> The main objective of increasing the positive reinforcement received by the depressed person. <5> The main objective of relating depression to problematic interpersonal situations.

4