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: What enzyme is present in complex II that participates in oxidative phosphorylation? 
 Options:  <1> Coenzyme Q: cytochrome c oxidoreductase. <2> NADH dehydrogenase. <3> Succinate-coenzyme Q reductase. <4> ATP synthase. <5> Cytochrome c oxidase.
