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'.

[EX 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
[EX A]: 2

[EX Q]: Question: The oppressive / tightening pain, of light to moderate intensity, of bilateral localization and that does not worsen with routine physical activity, is what occurs in: 
 Options:  <1> Pelvic pain <2> The burnout. <3> Asthma. <4> Irritable bowel syndrome. <5> Tension headache.
[EX A]: 5

[EX Q]: Question: The altered or minority nitrogenous bases: 
 Options:  <1> They are not detected in DNA. <2> They are not detected in the RNA. <3> They protect genetic information. <4> They are not detected in the tRNA. <5> They are not able to mate.
[EX A]:
3