You are presented with the quiz "What is produced by alcoholic fermentation of the glucose in corn or other plants?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "ethanol is produced by alcoholic fermentation of the glucose in corn or other plants" and "ethanol is the most widely used biofuel today". 

So, what's the best answer to the question?


 

       the most widely used biofuel    