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: 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 hydrides has the highest normal boiling point? 
 Options:  <1> SiH4. <2> CH4 <3> HCl. <4> PH3. <5> HF
[A]: 5


[Q]: Question: What characteristic increases the veracity of self-reports? 
 Options:  <1> Request information about past events. <2> Request information about events about which the evaluated person has little experience. <3> Use generic and open questions. <4> Request information on topics that involve little to the evaluated. <5> Use specific and unambiguous questions.
[A]:
5