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: volcanic ash in the atmosphere decreases the temperature by blocking the sun.
[A]: ash volcano.


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


[Q]: Fact: Any surface that has not been sterilized is likely to be covered with bacteria.
[A]:
bacteria can make people sick.