Task: Text Categorization
Input (English): Question: Indinavir is a selective inhibitor of HIV protease because: 
 Options:  <0> By hydrolysis, the active drug is generated. <1> Rents irreversibly the active center of the enzyme. <2> Its structure mimics the transition state of the reaction catalyzed by the enzyme. <3> It is a suicide inhibitor. <4> Its symmetric structure interacts effectively with the active center of the enzyme.
Output (English): pharmacology