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: Most invertebrates have brains capable of learning. 
Question: Most invertebrates have brains capable of what?
Example Output: learning.

Example Input: Fact: Antihistamines can help with certain infections. 
Question: What can help with sinus infections?
Example Output: antihistamines.

Example Input: Fact: Passive immunity lasts only as long as the antibodies survive in fluid contaminated with blood. 
Question: Passive immunity lasts only as long as the antibodies survive in fluid contaminated with what?
Example Output:
blood.