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

Output: plants.


Input: Consider Input: Fact: parasites can cause harmful diseases. 
Question: certain diseases can be caused by what?

Output: parasites.


Input: Consider Input: Fact: Earth's tilt on its rotating axis causes winter and summer to change. 
Question: what changes from earth's tilt on its rotating axis?


Output: winter and summer.