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: The vector of tularemia is a / a:
Options: <1> Coleoptera. <2> Louse. <3> Flea. <4> Tick. <5> Mosquito.
[EX A]: 4

[EX Q]: Question: Gallium is the element that is under the aluminum in group 13 of the periodic table. Thus:
Options: <1> It burns in oxygen giving Ga2O. <2> It is stable to air due to a protective oxide layer. <3> It dissolves very quickly in nitric acid. <4> It is not soluble in basic water with hydrogen evolution. <5> It has a melting point a little higher than aluminum.
[EX A]: 2

[EX Q]: Question: In its origins, the technique of Systematic Desensitization was explained from:
Options: <1> Operant conditioning. <2> Conditioning in a single trial. <3> Classical conditioning. <4> Vicar conditioning. <5> Instrumental conditioning.
[EX A]:
3