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: Female mammals have mammary glands.
[A]: female mammals.


[Q]: Fact: the Earth revolving around the Sun causes the seasons to change on its axis.
[A]: earth axis.


[Q]: Fact: tidal energy can be used to produce electricity.
[A]:
electricity current.