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'.

Input: Consider Input: 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.

Output: 3


Input: Consider Input: Question: Which of the following sequences is added during the maturation or processing of the eukaryotic transfer RNA ?: 
 Options:  <1> Splicing site 5 'of the intron. <2> CCA sequence of amino acid charge. <3> Anticodon <4> 3 'splicing site of the intron. <5> Leading sequence of the 5 'end.

Output: 2


Input: Consider Input: Question: Somatomedin IGF-1 causes: 
 Options:  <1> Secretion of GHRH. <2> Protein catabolism. <3> Hyperglycemia <4> Activation of osteoblasts <5> GH secretion


Output: 4