Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: The p-nitrobenzoic acid is: 
 Options:  <1> Less acid than benzoic acid. <2> Less acid than p-methoxybenzoic acid. <3> More acid than benzoic acid and with lower pKa. <4> More acid than benzoic acid and with higher pKa. <5> Less acid than p-methoxybenzoic acid and with lower pKa.
