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: 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: They send efferent projections from the cerebellar cortex the: 
 Options:  <1> Purkinje cells. <2> Climbing fibers <3> Granular cells. <4> Horizontal cells. <5> Mossy fibers.
Example Output: 1

Example Input: Question: Affective rigidity is characterized by: 
 Options:  <1> Rapid changes in mood. <2> Affective expression is discordant with the situation. <3> Absence of reactive positive feelings. <4> Inability to modulate affect depending on situations. <5> Little intense emotional responses.
Example Output:
4