Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: The electron transport molecules: 
 Options:  <1> They are coenzymes of a nucleotide nature. <2> They exchange electrons in oxidation-reduction reactions. <3> They are molecules capable of oxidation and reduction. <4> FAD (flavin adenine dinucleotide) and FMN (flavin mononucleotides) are electron transport molecules. <5> All are true.
