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.

[EX Q]: Fact: CPU time can be used as a clock. 
Question: What computer component can you use to measure time?
[EX A]: CPU.

[EX Q]: Fact: Cells are formed into tissues and tissues form the liver. 
Question: The liver is formed after cells for into?
[EX A]: tissue.

[EX Q]: Fact: Green plants can be used to produce electricity by burning. 
Question: What can a plant be used to produce when it's burned?
[EX A]:
Electricity.