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.
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Question: 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.

Answer: chemistry


Question: Question: The reaction between a ketone and a Grignard reagent causes, after hydrolysing the salt formed, a: 
 Options:  <0> Carboxylic ester. <1> Alcohol. <2> Ether. <3> Aldehyde. <4> Carboxylic acid.

Answer: chemistry


Question: Question: Which of these equalities is INCORRECT? 
 Options:  <0> Decil 1 = Centil 10. <1> Quartile 1 = Percentile 25. <2> Quartil 2 = Centil 20. <3> Decil 5 = Medium. <4> Quartile 3 = Centil 75.

Answer:
psychology