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: Most invertebrates have a nervous system.
[EX A]: invertebrate.

[EX Q]: Fact: damming a river can cause a lake to form.
[EX A]: beaver dam.

[EX Q]: Fact: a camera is used for recording images.
[EX A]:
camera canon.