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: 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: What element plays a physiological role in the prevention of gastroesophageal reflux? 
 Options:  <1> Upper esophageal sphincter <2> Angle of His. <3> Hernia of Hiato. <4> Purkinje angle. <5> Pyloric sphincter
[A]: 2


[Q]: Question: Which of the following analytical determinations is less useful for decision making in the follow-up and control of an HIV-infected person? 
 Options:  <1> CD4 lymphocyte count in peripheral blood. <2> Quantification of immunoglobulin. <3> Measurement of viral load. <4> Studies of HIV resistance to antiretroviral drugs. <5> Analysis of the co-receptor tropism.
[A]:
2