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: How are the proteins involved in the DNA curl and compaction called ?: 
 Options:  <0> Kinases <1> Topoisomerases <2> Histones. <3> Phosphatases <4> DNA nucleases

A: chemistry
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Q: Question: One of the enzymes mentioned below does not intervene in glycogen metabolism: 
 Options:  <0> Glycogen synthase. <1> Glycogen phosphorylase. <2> Glucose-6-phosphate dehydrogenase. <3> Phosphoglucomutase <4> UDP-glucose pyrophosphorylase.

A: chemistry
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Q: Question: If we value 25 mL of an H2A acid in concentration 0.1000M (pKa1 = 5, pKa2 = 9) with NaOH, the pH when we have evaluated 50% of the initial acid will be: 
 Options:  <0> one. <1> 3. <2> 5. <3> 7 <4> 9

A:
chemistry
****