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: With vaginal ultrasound, from how long after conception is it possible to see an embryo with a heartbeat? 
 Options:  <1> Between 14 and 21 days. <2> Between 21 and 28 days. <3> Between 28 and 35 days. <4> Between 35 and 42 days. <5> Between 42 to 49 days.

Ex Output:
2


Ex Input:
Question: The folded sheet β: 
 Options:  <1> It is formed by a single polypetide chain. <2> It presents a distance between adjacent amino acids of approximately 4 ångströms. <3> It is formed by the union of two or more strands by hydrogen bonds. <4> Presents the side chains of contiguous amino acids pointing to the same side. <5> They are of two types: parallel, where the chains of the β sheet go in a different direction and antiparallel, where they go in the same direction.

Ex Output:
3


Ex Input:
Question: The arenio ion is a reaction intermediate that is formed in the reactions of: 
 Options:  <1> Electrophilic addition. <2> Electrophilic aromatic substitution. <3> Nucleophilic substitution. <4> Nucleophilic addition. <5> Aromatic nucleophilic substitution.

Ex Output:

2