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: mineral graphite is used for making pencil lead.
[A]: Graphite.


[Q]: Fact: sexual reproduction increases genetic diversity.
[A]: genetic diversity creates evolution.


[Q]: Fact: Viruses often infect bacteria.
[A]:
bacteria define.