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: Epidemiology allows early detection of changes in the incidence of a certain disease in the population. For this, the most correct thing is to use: 
 Options:  <1> The etiological investigation. <2> The description of the natural history of the disease. <3> Epidemiological surveillance. <4> The evaluation of the functioning of the services. <5> None of the previous answers is correct.
[A]: 3


[Q]: Question: The microbiocidal action of iodine and chlorine and many of its derivatives is due to: 
 Options:  <1> They are oxidizing agents. <2> They bind specifically to the active centers of the enzymes. <3> They bind specifically to ribosomal proteins. <4> They induce pores in the membranes. <5> They cause the dissolution of membrane phospholipids.
[A]: 1


[Q]: Question: You are informing P. T. of hair loss that will occur about the second or third week of beginning chemotherapy treatment. It suggests you start using the wig before hair loss in order to: 
 Options:  <1> Hide alopecia. <2> Decrease depersonalization. <3> Provide alternatives to the patient. <4> Prepare for the loss and facilitate adjustment. <5> Facilitate the choice of the color wig and similar style before alopecia.
[A]:
4