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: Glycolysis and hepatic gluconeogenesis are regulated reciprocally by facilitated hormonal mechanisms, in addition to an important metabolite that determines whether glucose should be synthesized or degraded. Which?: 
 Options:  <0> Fructose 6-phosphate. <1> Fructose 1,6-bisphosphate. <2> Fructose 2,6-bisphosphate. <3> Pyruvate. <4> Lactate
[EX A]: chemistry

[EX Q]: Question: What amino acids can be bound to a sugar by an O-glycosidic bond? 
 Options:  <0> Ser and Thr. <1> Cys and Ser. <2> Asn and Thr. <3> Lys and His. <4> Val and Leu.
[EX A]: chemistry

[EX Q]: Question: The DiGeorge syndrome is linked to: 
 Options:  <0> A defective development of the thymus. <1> An alteration of the secondary lymphoid tissue. <2> An alteration of the M cells <3> A maturation defect of B lymphocytes <4> An alteration in the regulatory systems of the complement.
[EX A]:
pharmacology