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: paleontologists study the remains of plants. 
Question: What do palentologists study?
Example Output: plants.

Example Input: Fact: the platypus reproduces by laying eggs. 
Question: what reproduces by laying eggs?
Example Output: platypus.

Example Input: Fact: Expandable stems help many cacti survive in dry environments. 
Question: What feature of many cacti help them survive in dry environments?
Example Output:
Expandable stems.