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 Input:
Fact: threatening behavior causes a fight-or-flight response in animals.

Ex Output:
animal animalia members.


Ex Input:
Fact: a seismometer is used to measure the strength or magnitude of an earthquake.

Ex Output:
earthquake cause.


Ex Input:
Fact: Heterotrophs are living things that cannot make their own food.

Ex Output:

Heterotrophs.


