Task: Text Categorization
Input (English): Question: The reaction of ketones and aldehydes by the presence of their carbonyl group preferably gives: 
 Options:  <0> Nucleophilic substitution reactions. <1> Oxidation reactions to alcohols. <2> Nucleophilic addition reactions. <3> Reduction reactions to carboxylic acids. <4> They are not reactive towards nucleophiles.
Output (English): pharmacology