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: Bulbs require electrical energy to see in darkness. 
Question: Bulbs produce electrical energy to what?

Answer: see in darkness.


Question: Fact: mountain barriers can influence local weather changes. 
Question: what can mountain barriers influence?

Answer: local weather.


Question: Fact: Heating buildings is a very common production of energy worldwide. 
Question: What type of energy is produced the most worldwide?

Answer:
Heating.