TASK DEFINITION: Write a correct answer to the given question based on its associated fact. Make sure that your answer is contained in the associated fact. Don't be creative and introduce any new word that is not mentioned in the associated fact! Remember that the associated fact has been rearranged to form the question. So, the correct answer words must lie within the associated fact. The correct answer can be a word, phrase, or even a sentence.
PROBLEM: Fact: Irradiating food can be used to kill something that causes fermentation in the food. 
Question: Irradiating food can be used to kill what in the food?

SOLUTION: Something that causes fermentation.

PROBLEM: Fact: A vehicle in use requires navigation. 
Question: A vehicle in use requires?

SOLUTION: navigation.

PROBLEM: Fact: water changes from gas in the air to liquid by reducing heat energy. 
Question: What changes from gas in the air to liquid by reducing heat energy?

SOLUTION:
water.