Task: Text Categorization
Input (English): Question: The p-nitrobenzoic acid is: 
 Options:  <0> Less acid than benzoic acid. <1> Less acid than p-methoxybenzoic acid. <2> More acid than benzoic acid and with lower pKa. <3> More acid than benzoic acid and with higher pKa. <4> Less acid than p-methoxybenzoic acid and with lower pKa.
Output (English): pharmacology