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: Which of the following situations would noticeably decrease the transcription of a gene? 
 Options:  <0> The presence of a repressor and an inducing molecule. <1> The binding of RNA polymerase to DNA. <2> The presence of a repressor and a correpressor molecule. <3> The presence of an activator and its signal molecule. <4> The presence of a mutated repressor that could not bind to DNA.
[A]: pharmacology


[Q]: Question: When screening for a disease, aimed at high-risk groups, looking for disease in its initial stage, is called: 
 Options:  <0> Simple screening, non-selective, precocious. <1> Simple, selective, precocious screening. <2> Multiple, non-selective, late screening. <3> Multiple screening, selective, precocious. <4> Simple, selective, delayed screening.
[A]:
medicine


