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: We want to study if Vitamin D can increase the incidence of breast cancer. In our area we have a population registry of cancer. To achieve our goal, all women diagnosed with breast cancer are selected from the register we have and each case pairs with two controls. What study design has been chosen? 
 Options:  <1> Prospective cohort study. <2> Cases and controls study. <3> Case-control study nested. <4> Retrospective cohort study. <5> Ecological study

Output: 3


Input: Consider Input: Question: In the synthesis of DNA, the quinolones act: 
 Options:  <1> Joining the double helix and thus blocking the progress of the replication fork. <2> Interlacing in the double helix and thus causing errors in the transcription. <3> On DNA gyrase. <4> As nucleotide analogs that are incorporated into DNA. <5> About DNA polymerases.

Output: 3


Input: Consider Input: Question: Regarding substance abuse by the adolescent, point out the correct answer: 
 Options:  <1> It is usually an individual consumption which indicates a better prognosis. <2> The onset of abuse in adolescence has not shown an increased risk of becoming addicted. <3> It is independent of the risk of HIV infection. <4> The most popular drug among teenagers is cannabis. <5> It should be considered in adolescents who come to the emergency with a crisis.


Output: 5