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: A primary standard solution in a titration should not:
Options: <1> Be prepared from a high purity reagent. <2> Have an exactly known concentration. <3> Keep your composition over time. <4> React instantly. <5> Give rise to secondary reactions.
[A]: 5

[Q]: Question: The electron transport molecules:
Options: <1> They are coenzymes of a nucleotide nature. <2> They exchange electrons in oxidation-reduction reactions. <3> They are molecules capable of oxidation and reduction. <4> FAD (flavin adenine dinucleotide) and FMN (flavin mononucleotides) are electron transport molecules. <5> All are true.
[A]: 5

[Q]: Question: Mass spectrometry is combined with chromatography to generate a very powerful analytical tool. With regard to mass spectrometry (MS), it can be said that:
Options: <1> The electronic ionization is based on the ion-molecule reactions between the reactive gas ions and the analyte molecules. <2> The linear quadrupole mass analyzer consists of four cylinders that are placed in parallel so that they are positively and negatively charged alternately. <3> The flight time analyzer is based on a tube of highly charged material so that only the opposite charge ions enter and separate. <4> The ion trap can be placed at the end of the chromatographic column for molecular ions from the already separated analytes and impact on the screen of a radioactive detector. <5> The ionization method known as MALDI is based on the desorption of ions from a matrix in the form of a gel by rapid bombardment of supercritical gas.
[A]:
2