Task: Text Categorization
Input (English): Question: The electron transport molecules: 
 Options:  <0> They are coenzymes of a nucleotide nature. <1> They exchange electrons in oxidation-reduction reactions. <2> They are molecules capable of oxidation and reduction. <3> FAD (flavin adenine dinucleotide) and FMN (flavin mononucleotides) are electron transport molecules. <4> All are true.
Output (English): chemistry