In this task, you need to write a topic word from the given fact. The topic word must have at least one word overlap with the given fact. The topic word often involves adding a new word from a related concept. In your topic word, use at least one word from the given fact. Topic words with two or more words work best.

[EX Q]: Fact: producing thrust causes something to move.
[EX A]: engines produce thrust.

[EX Q]: Fact: Organisms use lipids to store energy.
[EX A]: human organisms.

[EX Q]: Fact: Nitrogen is found in proteins, nucleic acids, and chlorophyll.
[EX A]:
chlorophyll chloroplasts.