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: 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.
2

Question: When centrifuging human peripheral blood in a density gradient in Ficoll: 
 Options:  <1> The mononuclear cells float on the Ficoll. <2> The lymphocytes remain in the background. <3> The erythrocytes float on the Ficoll. <4> The granulocytes float on the Ficoll. <5> The monocytes remain in the background.
1

Question: The reaction of cyclopentene with an aqueous solution of bromine at 0 ° C originates: 
 Options:  <1> trans-1,2-dibromocyclopentane. <2> cis-2-bromocyclopentanol. <3> trans -2-bromocyclopentanol. <4> trans -1,2-cyclopentanediol. <5> cis-1,2-dibromocyclopentane.

3