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: a flashlight converts chemical energy into light energy.

A: battery chemical energy.
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Q: Fact: operating an automobile usually requires fossil fuels.

A: automobile car.
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Q: Fact: Most species go through larval stages after hatching.

A:
larval stage.
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