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.

Example Input: Fact: warblers are nocturnal and travel long distances at night. 
Question: What are nocturnal and travel long distances at night?
Example Output: warblers.

Example Input: Fact: When a population suddenly gets much smaller the effects are unpredictable. 
Question: What is the effect of a population suddenly getting much smaller?
Example Output: it is unpredicatbale.

Example Input: Fact: A ruler can be used to measure masculinity. 
Question: What instrument can be used to measure masculinity?
Example Output:
ruler.