Task: Text Categorization
Input (English): Question: The eudismic index is a parameter with pharmacological interest that expresses the relationship between: 
 Options:  <0> Two diastereomer drugs. <1> Two bioisostero drugs. <2> Two enantiomers <3> A drug and a prodrug, structural analog. <4> Two structural modifications, one hydrophilic and one lipophilic, of a certain drug.
Output (English): pharmacology