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.

Input: Consider Input: Fact: Beavers cause ponds and lakes to form. 
Question: What can be the cause of lakes and ponds forming?

Output: beavers.


Input: Consider Input: Fact: Starfish lack respiratory and excretory systems. 
Question: What is an example of an animal that lacks a respiratory and excretory system?

Output: Starfish.


Input: Consider Input: Fact: Circle graphs can be used to show decimal fractions. 
Question: What can be used to show decimal fractions?


Output: Circle graphs.