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: Nests are used to protect eggs from predators and extreme temperatures. 
Question: What are used to protect eggs from predators and extreme temperatures?

Ex Output:
nests.


Ex Input:
Fact: space exploration is not possible without navigation. 
Question: What is used for space exploration?

Ex Output:
navigation.


Ex Input:
Fact: detailed observation of distances to stars requires a telescope. 
Question: detailed observation of stars what requires a telescope?

Ex Output:

distance.