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: Hypokalemia is a physiological symptom that can typically occur: 
 Options:  <0> In sleep disorders. <1> In addictions. <2> In anorexia nervosa. <3> In bulimia but not in anorexia nervosa. <4> In disorders of attention deficit and disturbing behavior.
[A]: psychology


[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.
[A]: pharmacology


[Q]: Question: The mitochondrial complex α-ketoglutarate dehydrogenase needs all the following compounds EXEPT: 
 Options:  <0> CoA. <1> FAD. <2> NAD +. <3> NADP +. <4> Thiamine pyrophosphate.
[A]:
chemistry