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: In acute coronary syndrome with ST-segment elevation, heparin is used because: 
 Options:  <1> It is fibrinolytic, since it destroys the thrombus. <2> It inhibits the formation of more thrombi and prevents their recurrence. <3> It inhibits platelet aggregation. <4> Restores the patency of the coronary artery immediately. <5> All the previous answers are correct.
[EX A]: 2

[EX Q]: Question: Ammonia usually used in the laboratory: 
 Options:  <1> It is a pure compound, liquid at environmental temperature and pressure. <2> It is a gaseous ammonia solution in water, very diluted, because ammonia is very little soluble in water. <3> It is a solution of gaseous ammonia in water, very concentrated, because ammonia is very soluble in water. <4> It is a gaseous ammonia solution in ethanol, because pure gaseous ammonia is insoluble in water. <5> It is a saturated solution of ammonium chloride in water.
[EX A]: 3

[EX Q]: Question: How is the correction of an erroneous amino acid incorporated in the process of translation in the ribosome carried out? 
 Options:  <1> There is no possibility of elimination of an amino acid in the synthesis of proteins. <2> Through the aminoacyl peptidase activity of the ribosome. <3> A dipeptidase removes the wrong amino acid, before proceeding with the synthesis. <4> Thanks to the fact that amino acids are energy-rich molecules. <5> There is a post-translational sequence review system.
[EX A]:
1