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: plant reproduction often requires pollen.

A: bees carry pollen.
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Q: Fact: Earthworms are important deposit feeders that help form and enrich soil.

A: deposit feeders.
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Q: Fact: triceps contracting causes a person 's elbow to straighten.

A:
Elbow joint.
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