Task: Text Categorization
Input (English): Question: The reaction of benzene with tertbutyl chloride, in the presence of aluminum trichloride, is an example of: 
 Options:  <0> Nucleophilic aromatic substitution reaction. <1> Electrophilic aromatic substitution. <2> Addition of halogens. <3> Acid catalyzed hydrolysis. <4> Obtaining alkyl halides.
Output (English): pharmacology