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.

Ex Input:
Fact: ancestors of hagfish probably had backbones. 
Question: What did ancestors of hagfish probably have?

Ex Output:
backbone.


Ex Input:
Fact: most bigger cities require vehicles. 
Question: What do most bigger cities require?

Ex Output:
vehicles.


Ex Input:
Fact: Chemical energy converted to light energy requires batteries. 
Question: What is required so that chemical energy may be converted to light energy?

Ex Output:

batteries.