You are presented with the quiz "What does cooking food do?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "irradiating food can be used to kill existing microorganisms in the food" and "cooking either diminishes or eliminates the vitamins and enzymes in fresh foods as does irradiation". 

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


 

    Kills organisms and vitamins       