Task: Text Categorization
Input (English): Question: A coenzyme is: 
 Options:  <0> A molecule of an organic nature, necessary for the activity of an enzyme. <1> The inorganic part of an enzyme. <2> A molecule of a protein nature, necessary for the activity of an enzyme. <3> Any molecule of a non-vitamin nature that contributes to increase the activity of an enzyme. <4> An allosteric effect that modifies the spatial configuration of enzymes.
Output (English): pharmacology