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: The Merkel cells are:
Options: <1> Secretors of neuropeptides and sensory. <2> Secretors of mucus. <3> Migratory <4> From Schwann. <5> Fibroblasts.
Example Output: 1

Example Input: Question: An Au-Ag alloy:
Options: <1> It is interstitial, and can occur in any composition. <2> It is substitutional, and can occur in any composition. <3> Gold and silver can not be alloyed. <4> A small amount of gold can be dissolved in silver, up to a limit of close to 10%, but not in a greater proportion. <5> A small amount of silver can be dissolved in the gold, up to a limit close to 10%, but not in a greater proportion.
Example Output:
2