Task: Text Categorization
Input (English): Question: Ketogenic amino acids: 
 Options:  <0> They may contribute to the synthesis of glucose. <1> They are intermediaries of the urea cycle. <2> They are the substrate of reactions catalyzed by transketolase. <3> They can produce acetyl-coenzyme A. <4> They are eliminated in the form of ketoses.
Output (English): biology