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: What serum immunoglobulin will synthesize an activated B lymphocyte that has not been stimulated through CD40 ?: 
 Options:  <1> Any. <2> IgE <3> IgM <4> IgA <5> IgG
Example Output: 3

Example Input: Question: In the determination of water hardness due to the presence of Ca2 + and Mg2 + ions, the titrant reagent is used: 
 Options:  <1> Methyl orange. <2> A standard solution of potassium chloride. <3> Black Eriochrome T. <4> A standard solution of ethylenediaminetetraacetic acid (EDTA). <5> A solution of AEDT previously standardized against a solution of potassium phthalate.
Example Output: 4

Example Input: Question: The nurse identifies that the person she has evaluated presents a series of manifestations that correspond to the defining characteristics of a diagnostic label, however, does not identify any possible cause. How should you enunciate the diagnosis following the guidelines of the PES format? 
 Options:  <1> Problem related to unknown cause manifested by the defining characteristics identified. <2> Using the term related to instead of due to, between problem and etiology. <3> As a risk diagnosis. <4> Problem related to the defining characteristics identified. <5> The absence of cause means that there is no problem, so a diagnosis could not be stated.
Example Output:
1