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 Input:
Question: After the reaction of some xenobiotics with glutathione, the final product is formed: 
 Options:  <1> Sulfanil urea. <2> Reduced glutathione <3> Oxidized glutathione. <4> Thiosulfate. <5> Mercapturic acid.

Ex Output:
5


Ex Input:
Question: The type of epidemiological study indicated to evaluate, in a population initially exempt from the health problem under study, the association between a risk factor and the onset of the disease is: 
 Options:  <1> Randomized clinical trial. <2> Quasi experimental. <3> Ecological studies <4> Cases and controls study. <5> Cohort study.

Ex Output:
3


Ex Input:
Question: The most common ectopic pregnancy occurs in: 
 Options:  <1> The fallopian tube. <2> The oviductal tube. <3> The cervix <4> The ovary <5> The abdomen.

Ex Output:

1