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.

[Q]: Fact: living things all require energy for survival.
[A]: energy food.


[Q]: Fact: a measuring cup is used for measuring the volume of substances.
[A]: liquid volume.


[Q]: Fact: Carbon monoxide is a gas produced by furnaces and other devices that burn fuel.
[A]:
Carbon monoxide.