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: x-rays are used in medical technology.

A: medical technology helps.
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Q: Fact: Bile reduces the acidity of food entering from the highly acidic stomach.

A: acid reduction.
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Q: Fact: Roots have primary and secondary meristems for growth in length and width.

A:
length width meters.
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