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: 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.

A: chemistry
****
Q: Question: The terpene that contains 10 carbon atoms and is derived from two isoprene units is called: 
 Options:  <0> Diterpene <1> Monoterpene <2> Sesquiterpene <3> Triterpene <4> Meroterpeno.

A: chemistry
****
Q: Question: Which of the following alcohols has the lowest pKa value ?: 
 Options:  <0> Ethanol. <1> 2-Chloroethanol. <2> 2-Propanol. <3> 2,2,2-Trifluoroethanol. <4> 1,1-Dimethylethanol.

A:
chemistry
****