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: When comparing the characteristics of pragmatic or confirmatory clinical studies with explanatory or exploratory clinical studies, which of the following is an advantage of the former? 
 Options:  <1> Information about subgroups of patients representative of the usual clinical practice. <2> Very homogeneous sample, with little variability. <3> Greater capacity to detect differences in the effectiveness of interventions. <4> Greater internal validity <5> Smaller sample size

Output: 1


Input: Consider Input: Question: The set of means and systems that facilitate the contact of the infectious agent with the recipient subject corresponds to: 
 Options:  <1> Source of infection. <2> Habitat. <3> Transmission mechanism. <4> Biotope <5> Reservoir.

Output: 3


Input: Consider Input: Question: What characterizes the objective techniques of psychophysiological evaluation? 
 Options:  <1> They are tests with a high ecological validity. <2> Environmental factors (e.g., light, temperature) can affect the reliability of the record. <3> The anxious subjects usually have the same level of activation as the non-anxious ones. <4> Subjects with different anxiety disorders usually have similar patterns of activation at baseline. <5> Subjects with different anxiety disorders usually have similar responses to different stimuli.


Output: 2