Task: Text Categorization
Input (English): Question: What enzyme is present in complex II that participates in oxidative phosphorylation? 
 Options:  <0> Coenzyme Q: cytochrome c oxidoreductase. <1> NADH dehydrogenase. <2> Succinate-coenzyme Q reductase. <3> ATP synthase. <4> Cytochrome c oxidase.
Output (English): chemistry