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.

[EX Q]: Question: As to the height of the plate (H) in a column chromatographic separation it can be said that: 
 Options:  <0> It is inversely proportional to the variance (standard deviation of the band). <1> It is directly proportional to the number of theoretical plates and inversely proportional to the length of the column. <2> It is directly proportional to the variance and inversely proportional to the distance traveled by the center of the band to the detector (L). <3> It is directly proportional to the variance and distance traveled by the center of the band to the detector (L). <4> It does not depend on the variance or the distance traveled by the center of the band.
[EX A]: pharmacology

[EX Q]: Question: Indicate the net charge of an amino acid with a neutral R group for a pH value below its pI: 
 Options:  <0> Negative net charge. <1> Positive net charge. <2> Without charge. <3> It is necessary to know the exact pH value to answer this question. <4> It is necessary to know the concentration of the amino acid to answer this question.
[EX A]: chemistry

[EX Q]: Question: A conjugated protein is: 
 Options:  <0> A protein that contains chemical components different from the permanently associated amino acids. <1> A protein that contains amino acids with side chains with conjugated bonds. <2> A protein that contains chemical components that make it insoluble. <3> A protein incorrectly folded. <4> A denatured and inactivated protein.
[EX A]:
chemistry