TASK DEFINITION: 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.
PROBLEM: Question: The reaction of 3-nitrobenzaldehyde with NaBH 4 in aqueous methanol gives: 
 Options:  <0> 3-Aminobenzaldehyde. <1> 3-nitrobenzoic acid. <2> 1-Methyl-3-nitrobenzene. <3> 3-Nitrobenzoate sodium. <4> (3-Nitrophenyl) methanol.

SOLUTION: chemistry

PROBLEM: Question: After the intake increases the release of: 
 Options:  <0> Insulin. <1> ACTH. <2> Cortisol <3> Adrenaline from the adrenal medulla. <4> GH

SOLUTION: biology

PROBLEM: Question: Enzymatic regulation by phosphorylation: 
 Options:  <0> It is reversible. <1> It requires enzymes that directly introduce the Pi. <2> Introduce the Pi into acidic and basic amino acids. <3> Always activate enzymes. <4> It is carried out by phosphatases.

SOLUTION:
biology