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 oxygen of the ethers as that of the alcohols can be protonated to generate: 
 Options:  <1> Iminium ion. <2> Alkaloxonium ions. <3> Peroxides <4> Piranos. <5> Enaminas
[EX A]: 2

[EX Q]: Question: The denaturing of DNA: 
 Options:  <1> It increases when the temperature decreases. <2> It is accompanied by an increase in the absorption of UV light. <3> DNA with high G / C content does so at a lower temperature than those rich in A / T. <4> It is irreversible. <5> Indicates the hydrolysis of phosphodiester bonds.
[EX A]: 2

[EX Q]: Question: Which of the following pathogens is the cause of cat scratch disease? 
 Options:  <1> Bartonella henselae. <2> Mycobacterium tuberculosis. <3> Mycobacterium avium complex. <4> Toxoplasma gondii. <5> Epstein Barr virus.
[EX A]:
1