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: sunlight causes rainbows. 
Question: what causes rainbows?

Answer: sunlight.


Question: Fact: Monotremes lay eggs. 
Question: What is the distinguishing feature of monotremes?

Answer: They lay eggs.


Question: Fact: If a person falls ill it may be due to a pathogen. 
Question: If a person does what it may be due to a pathogen?

Answer:
falls ill.