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.

[Q]: Fact: Burning fuel in furnaces can kill. 
Question: Burning fuel in a furnace can?
[A]: kill.


[Q]: Fact: Bioterrorism is the spread of pathogens. 
Question: What does bioterrorism spread?
[A]: Pathogens.


[Q]: Fact: telescopes are optical tools. 
Question: which of the following is an optical tool?
[A]:
telescope.