Task: Text Categorization
Input (English): Question: Grapefruit juice is: 
 Options:  <0> A potent enzyme inducer of cytochrome P450 (CYP3A4). <1> A potent enzyme inhibitor of cytochrome P450 (CYP3A4). <2> A promoter of the absorption of drugs administered orally. <3> An advisable food to increase the bioavailability of drugs of acidic nature. <4> A food without consequence in the kinetics of disposal of drugs eliminated by metabolism in which cytochrome P450 is involved.
Output (English): pharmacology