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: Of the following pairs of surface molecules, what is used by the virgin T lymphocytes to extravasate to the lymph node? 
 Options:  <1> CCR7 and L-selectin. <2> VCAM and L-selectin. <3> CCR7 and ICAM-1. <4> CCR9 and L-selectin. <5> CCR4 and VCAM-1.

Ex Output:
1


Ex Input:
Question: Which of the following moments of the electrocardiogram corresponds to the depolarization stage of the ventricular myocardium ?: 
 Options:  <1> Onda P. <2> Onda T. <3> Segment T-P. <4> Segment P-Q. <5> QRS wave.

Ex Output:
5


Ex Input:
Question: Unlike receptors of adaptive immunity, those of innate immunity are characterized by: 
 Options:  <1> Have a clonal distribution. <2> Its greatest diversity <3> Be identical in cells of the same lineage. <4> Recognize and react against own molecules. <5> Being only on the cell surface.

Ex Output:

3