instruction:
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'.
question:
Question: Which of the following gases is the most abundant in the alveolar air? 
 Options:  <1> Oxygen. <2> Carbon dioxide <3> Water vapor. <4> Carbon monoxide. <5> Nitrogen.
answer:
5


question:
Question: Glucagon increases the activity of: 
 Options:  <1> Protein kinase A. <2> Acetyl-CoA carboxylase. <3> Pyruvate kinase. <4> Glycogen synthase. <5> Fosfofructoquinasa-1.
answer:
1


question:
Question: During ventricular systole: 
 Options:  <1> All ventricular blood is expelled. <2> Intraventricular pressure is equal in both ventricles. <3> The ventricular volume begins to decrease from the beginning of the contraction. <4> The atrio-ventricular valves are open. <5> The atria are relaxed.
answer:

5