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: Infancy is the period of most rapid growth after birth.

A: Infancy.
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Q: Fact: Plants exhibit phototropism, or growing toward a light source.

A: electricity can produce light.
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Q: Fact: seconds are used to measure time.

A:
light year.
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