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.

Fact: Condoms make sex safe if they're not used incorrectly. 
Question: When aren't condoms safe?
When they're used incorrectly.

Fact: A prism is used to split light into colors. 
Question: What does a prism split light into?
colors.

Fact: hermit crabs use calcium for their homes. 
Question: What do hermit crabs use for their homes?

calcium.