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: an incandescent light bulb converts electricity into light by sending electricity through a filament.

A: electricity batteries.
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Q: Fact: Hagfish are noted for secreting large amounts of thick, slimy mucus.

A: hagfish ancient.
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Q: Fact: rain causes erosion.

A:
erosion can destroy buildings.
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