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: Enzymatic regulation by reversible covalent modification:
Options: <0> It involves the breaking of the peptide bond. <1> It requires the action of another enzyme. <2> It always involves phosphorylation reaction. <3> It never affects allosteric enzymes. <4> The enzyme never comes in two forms.
[EX A]: biology

[EX Q]: Question: Regarding benign prostatic hypertrophy, it is NOT true that:
Options: <0> Abdominal ultrasound is a non-invasive method to assess prostate size and post-voiding residual. <1> It can cause increases in PSA levels. <2> Rectal examination is a method to estimate prostate size. <3> Treatment with 5-alpha reductase inhibitors decreases symptoms. <4> It is a precancerous lesion.
[EX A]: medicine

[EX Q]: Question: The main techniques in Social Skills Training for people with schizophrenia include modeling, behavior testing and feedback. But what other techniques are recommended ?:
Options: <0> Relaxation techniques. <1> Targeted discussion techniques and the nominal group technique (TGN). <2> Techniques of instigation (Prompting) and lecturing (Coaching). <3> Biofeedback techniques. <4> Mindfulness techniques.
[EX A]:
psychology