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 the respiratory chain: 
 Options:  <1> Ferrosulfurized proteins contain heme groups. <2> The heme groups are in carotenoids. <3> Cytochromes contain iron and sulfur groups. <4> Ubiquinones transport protons and electrons. <5> All transporters carry two electrons.
[EX A]: 4

[EX Q]: Question: To detect the occurrence of prerenal acute renal failure in a patient, the nurse should monitor the presence of: 
 Options:  <1> Signs of low cardiac output. <2> Hematuria <3> Urine cloudy and smelly. <4> Colic pain <5> Elevation of creatinine clearance.
[EX A]: 1

[EX Q]: Question: The α-keratin consists of: 
 Options:  <1> Two dextrorotative α-propellers coiled to form a left-handed helix. <2> Two dextrorotary propellers coiled to form a left-handed helix. <3> Two levorotylar helices coiled to form a levorotatory helix. <4> Two levógiras α helices coiled to form a dextrorotatory helix. <5> One helix α levorotatory and one dextrorotatory coiled to form a levorotatory helix.
[EX A]:
1