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: 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: What are the leaders of the Structural / Strategic School of Systemic Therapy? 
 Options:  <0> O'Hanlon and Weiner-Davis. <1> Haley and Minuchin. <2> Weakland and Fisch. <3> Keeney and Ross. <4> Stierlin and Weber.
[EX A]: psychology

[EX Q]: Question: The eggs are operculated: 
 Options:  <0> Hymenolepis nana. <1> Trichinella spiralis. <2> Enterobius vermicularis. <3> Fasciola hepatica. <4> Ascaris lumbricoides.
[EX A]:
biology