Task: Text Categorization
Input (English): Question: Friedel-Crafts alkylation reactions lead to products that: 
 Options:  <0> They facilitate diazotization reactions. <1> They facilitate the reactions of formation of ethers. <2> Activate the aromatic ring against other substitutions. <3> They deactivate the aromatic ring against other substitutions. <4> None of the above.
Output (English): chemistry