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'.

[Q]: 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.
[A]: 4


[Q]: Question: A patient from Bolivia diagnosed with Chagas disease underwent a blood count that showed 1,100 eosinophils / μL (12% of leukocytes). Which of the following diagnoses is LESS likely? 
 Options:  <1> Infestation by Schistosoma haematobium. <2> Infestation by Ancylostoma duodenale. <3> Infestation by Strongyloides stercoralis. <4> Infestation by Ascaris lumbricoides. <5> Infestation by Necator americanus.
[A]: 1


[Q]: Question: In mitosis, the nuclear membrane disintegrates and spindle microtubules bind to the kinetochores in: 
 Options:  <1> Cytokinesis <2> Prometaphase. <3> Metaphase <4> Interface. <5> Prophase.
[A]:
2