Task: Text Categorization
Input (English): Question: Which of the following enzyme complexes catalyzes the reduction of molecular oxygen to water during oxidative phosphorylation? 
 Options:  <0> ATP synthase. <1> Cytochrome c oxidase. <2> NADH-Q oxide-reductase. <3> Q-cytochrome c-oxide-reductase. <4> Succinate-Q reductase.
Output (English): chemistry