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


question:
Fact: Stopping or slowing for turns can cause skidding. 
Question: Stopping or slowing for turns can cause what?
answer:
skidding.


question:
Fact: Vision is detected by sensory nerve cells. 
Question: How is vision detected?
answer:

sensory nerve cells.