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.

Ex Input:
Fact: Lung cancer is most often caused by exposure to cigarettes. 
Question: What is lung cancer most often caused by exposure to?

Ex Output:
cigarettes.


Ex Input:
Fact: Ribosomes are sites where enzymes are made. 
Question: Ribosomes are sites where what?

Ex Output:
enzymes are made.


Ex Input:
Fact: vesicle transport requires energy, and is a form of diffusion. 
Question: what is vesicle transport a form of?

Ex Output:

diffusion.