In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.

[Q]: Question: In a potentiometry at zero intensity the electrode: 
 Options:  <0> Indicator always measures balance potentials. <1> Indicator measures the half-wave potential. <2> Indicator can measure a mixed potential. <3> Reference is always a calomel platinum electrode. <4> Indicator is always a platinum electrode.
[A]: chemistry


[Q]: Question: It has been 24 hours since D. J., 28, has undergone an abdominal surgery. When he enters the room he smiles and jokes with the visitors. The blood pressure is 130/74 mmHg, the heart rate is 80, and the respiratory rate is 18. He tells him that he has pain and on a numerical scale of pain intensity from 0 (without pain) to 10 (the worst possible pain), DJ scores his pain in 8. Based on these data, point out the number you would choose to represent the assessment of this man's pain: 
 Options:  <0> 9. <1> 8 <2> 7 <3> 6 <4> 5.
[A]: nursery


[Q]: Question: Every experimental measurement is accompanied by the corresponding experimental error. Experimental errors are classified as systematic and random. On these last ones it is possible to be affirmed that: 
 Options:  <0> They are due to a failure of the experiment or the equipment. <1> They generally cause a positive deviation from the measurement. <2> They are equally likely to be positive or negative. <3> They do not affect the final result because they are random. <4> They affect exclusively the accuracy of the results obtained.
[A]:
chemistry