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.
--------
Question: Fact: An item's weight causes its gravitational force. 
Question: The weight of an item causes its what?

Answer: gravitational weight.


Question: Fact: DNA messages to proteins are manufactured by RNA. 
Question: DNA messages to proteins are manufactured by what?

Answer: RNA.


Question: Fact: Lymphocytes  are the key cells involved in allergies. 
Question: Lymphocytes are a key cell involved in what type of reaction?

Answer:
allergic.