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: What are the components of a functional heme group ?: 
 Options:  <0> Four molecules of bilirubin and one Fe3 +. <1> Four globins (2alpha + 2beta) and one Fe3 +. <2> One molecule of protoporphyrin and one Fe2 +. <3> One molecule of bilirubin and one Fe2 +. <4> Four globins (2alpha + 2beta) and one Fe2 +.
[EX A]: pharmacology

[EX 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
[EX A]: chemistry

[EX Q]: Question: Regarding enzymatic cofactors: 
 Options:  <0> All enzymes are required to be active. <1> Its binding to the enzyme is always covalent. <2> There are no two enzymes that use the same cofactor. <3> They can be metal ions. <4> They only have structural function.
[EX A]:
biology