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'.

Example Input: Question: The simultaneous expression of IgM and IgD is observed for the first time in lymphocytes: 
 Options:  <1> Early Pro-B. <2> B mature. <3> Late Pro-B. <4> Pre-B. <5> B immature
Example Output: 2

Example Input: Question: To multiply, the rhabdoviruses enter the host cell by: 
 Options:  <1> Viropexy <2> Endocytosis <3> Depopolimerization of the virion as a consequence of the interaction with the cellular receptor. <4> Direct translocation <5> Opsonic phagocytosis.
Example Output: 2

Example Input: Question: We want to compare the means of two populations that follow normal distributions and have the same variance. We take two samples of size n1 and n2. When constructing a confidence interval we will have to calculate a value t for a Student's T distribution with: 
 Options:  <1> 2 degrees of freedom. <2> n1 + n2 - 2 degrees of freedom. <3> (n1 + n2) - 1 degrees of freedom. <4> (n1 x n2) / 2 degrees of freedom. <5> Degrees of freedom calculated with the formula of Welch or Smith-Satterwhite.
Example Output:
2