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: Liquid chromatography in normal phase: 
 Options:  <1> It uses a column with apolar groups that interact with the apolar part of the analytes differentially. <2> It is a mode of operation that employs a polar stationary phase with a low polarity mobile phase. <3> It uses highly polar mobile phases such as alkanes or chloroalkanes. <4> It is a mode of operation that employs a non-polar surface with a mixed aqueous / organic mobile phase. <5> It uses stationary phases with a large number of hydrophobic alkyl ligands.

Ex Output:
2


Ex Input:
Question: For a drug to permeate through the cornea, you must: 
 Options:  <1> Be totally ionized. <2> Present a very high polarity. <3> Join the lysozyme that is present in the tear fluid. <4> Present a certain lipophilicity and a minimum degree of water solubility. <5> Have weak acid character.

Ex Output:
4


Ex Input:
Question: Usually the training of sperm occurs in: 
 Options:  <1> The seminiferous tubules. <2> The epididymis <3> The male urethra. <4> The vagina <5> The uterus.

Ex Output:

5