instruction:
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.
question:
Fact: Plants respond to green manures to disrupt plant disease. 
Question: Plants respond to what to disrupt plant disease?
answer:
green manures.


question:
Fact: Heating with coal can cause air pollution. 
Question: Heating with coal can cause?
answer:
air pollution.


question:
Fact: Viruses are usually considered to be made up of atoms. 
Question: Viruses are usually considered to be what?
answer:

made up of atoms.