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: Power outages can cause a light bulb to go off. 
Question: What do power outages do to light bulbs?
answer:
turn them off.


question:
Fact: most bigger cities require vehicles. 
Question: What do most bigger cities require?
answer:
vehicles.


question:
Fact: some plant processes are negatively impacted in the absence of light. 
Question: what process sometimes only happens with no light?
answer:

photosynthesis.