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: What simple reinforcement programs produce a more stable response pattern ?: 
 Options:  <0> Those of fixed ratio. <1> Those of variable reason. <2> Those of fixed interval. <3> Those of variable interval. <4> All reinforcement programs produce similar response rates.
[A]: psychology


[Q]: Question: A positive coagulase test is typical of: 
 Options:  <0> Staphylococcus aureus. <1> Staphylococcus epidermidis. <2> Haemophilus influenzae. <3> Neisseria meningitidis. <4> Escherichia coli
[A]: biology


[Q]: Question: For the determination of polychlorinated biphenyls is an environmental sample by gas chromatography, the most appropriate detector would be: 
 Options:  <0> Of flame ionization. <1> Of electronic capture. <2> Thermoionic <3> Of photoionization. <4> Amperometric.
[A]:
chemistry