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: A primary standard solution in a titration should not: 
 Options:  <1> Be prepared from a high purity reagent. <2> Have an exactly known concentration. <3> Keep your composition over time. <4> React instantly. <5> Give rise to secondary reactions.
[A]: 5


[Q]: Question: In an evaluation the redox indicator In (ox) + ne-  In (network) is used, whose normal potential is E0. The color change will occur: 
 Options:  <1> To the potential of the equivalence point. <2> To the value of E0. <3> In the interval E0  0.059 / n. <4> In the interval E0 (ox) - E0 (network) if it is evaluated with a reducer. <5> At the potential of 0.059 / n.
[A]: 3


[Q]: Question: When performing an electrocardiogram you will notice that the QRS complex is predominantly negative in the derivation: 
 Options:  <1> V1 <2> AVF. <3> V5 <4> V6. <5> DIII.
[A]:
1