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: The flu is not affected by antibiotics, only a vaccine. 
Question: What affects the flu?

Answer: Vaccines.


Question: Fact: A sessile adult can be a filter feeder. 
Question: A sessile what can be a filter feeder?

Answer: adult.


Question: Fact: A telescope is used for observing a pulsar. 
Question: A telescope is used for observing a?

Answer:
pulsar.