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: An allosteric modulator influences the activity of an enzyme: 
 Options:  <1> Competing with a substrate for the catalytic site. <2> Joining the enzyme at a site other than the catalytic site. <3> Changing the nature of the formed product. <4> Changing the specificity of the enzyme for the substrate. <5> Denaturing the enzyme.
