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: temperature can change the state of matter. 
Question: What can change the state of matter?
Example Output: temperature.

Example Input: Fact: cloning is the process of isolating and making copies of a unit of heredity. 
Question: What is the process of isolating and making copies of a unit of heredity?
Example Output: cloning.

Example Input: Fact: heat can be used to separate a solute from a solvent in a solution. 
Question: What can be used to separate a solute from a solvent in a solution?
Example Output:
heat.