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'.

Q: Question: The alkali halides, MX: 
 Options:  <1> They are solids that melt below 100ºC. <2> They form crystals of intense colors. <3> They can be obtained by reaction of the M2CO3 carbonates with the aqueous solutions of the HX hydrogen halides. <4> None of them can be found in nature. <5> They are liquid at room temperature.

A: 3
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Q: Question: At what stage is the person when they begin to balance the positive and negative consequences of drug use and, as a result, begin to consider stopping consumption, but basically maintain their ambivalence in this decisional balance? 
 Options:  <1> Stadium of action. <2> Contemplation stadium. <3> Relapse stadium. <4> Pre-contemplation stadium. <5> Post-relapse stadium.

A: 2
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Q: Question: The proofreading activity of the DNA Polymerase is an activity: 
 Options:  <1> 5'-3'Exonuclease. <2> 3'-5'Exonuclease. <3> Polymerizing 5'-3 '. <4> Endonuclease. <5> Transesterifier.

A:
2
****