Task: Text Categorization
Input (English): Question: During oxidative phosphorylation, the proton-motor force generated by electronic transport is used to: 
 Options:  <0> Create a pore in the inner mitochondrial membrane. <1> Generate substrates (ADP and Pi) for ATP synthase. <2> Induce a conformational change in the ATP synthase. <3> Oxidize NADH to NAD +. <4> Reduce O2 to H2O.
Output (English): chemistry