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: Plants exhibit phototropism, or growing toward a light source.

A: electricity can produce light.
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Q: Fact: Flowing water can slowly dissolve carbon in sedimentary rock.

A: flowing water fall force.
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Q: Fact: bacteria can cause people to become ill.

A:
KILL BACTERIA.
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