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: Pruritus is a typical manifestation of all the following diseases, except: 
 Options:  <0> Hodgkin lymphoma. <1> Polycythemia vera. <2> Mycosis fungoides <3> Systemic mastocytosis. <4> Acute myeloblastic leukemia.
[EX A]: medicine

[EX Q]: Question: Given three DNA molecules of the same length (A, B and C) and in the same solvent, but with different richness in terms of G + C content (A: 50%, B: 60%, and C: 75% ), How would your melting temperatures (Tm) be ?: 
 Options:  <0> A> B> C. <1> Being in the same solvent, they would be the same in all three cases. <2> The DNA molecule C would not belong to a thermophilic bacterium, given its lower Tm. <3> C> B> A. <4> You can not know with the information of the statement.
[EX A]: pharmacology

[EX Q]: Question: Which of these species is a free radical? 
 Options:  <0> The molecule NO. <1> The O2 molecule. <2> The N2O molecule. <3> The OH- anion. <4> The ClO- anion.
[EX A]:
chemistry