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: Birds move their wings using muscles in the chest.
[EX A]: Birds move their wings using muscles in the chest.

[EX Q]: Fact: Tunicates reproduce sexually.
[EX A]: sexual reproduction requires two organisms.

[EX Q]: Fact: pasteurization reduces the amount of bacteria in milk.
[EX A]:
bacteria found in milk.