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.

[EX Q]: Fact: a warm front causes cloudy and rainy weather.
[EX A]: cloudy and rainy weather.

[EX Q]: Fact: rocks interacting with wind over long periods of time causes weathering.
[EX A]: rock limestone.

[EX Q]: Fact: Most hormones are regulated by feedback mechanisms.
[EX A]:
Hormones are chemical.