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: Under the name of xanthines are grouped: 
 Options:  <1> The coca leaf, cocaine and crack. <2> Methadone and heroin <3> The MDA and the MDMA. <4> Nicotine and inhalants. <5> Caffeine and theophylline.
[EX A]: 5

[EX Q]: Question: The excitotoxins activate: 
 Options:  <1> Nicotinic receptors <2> GABAA receptors <3> Glycine receptors. <4> NMDA receivers. <5> Na + channels dependent on voltage.
[EX A]: 4

[EX Q]: Question: Calcium hydroxide: 
 Options:  <1> It is prepared by adding water to calcium oxide. <2> It is a compound of intense red color. <3> It crystallizes when heated. <4> In solution it remains unchanged in air for months. <5> It is used to paint after neutralizing with HCl.
[EX A]:
1