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: Skin color is another polygenic trait.

Ex Output:
polygenic loci.


Ex Input:
Fact: skin is used for breathing air by frogs.

Ex Output:
air oxygen.


Ex Input:
Fact: Humans have collected and grown mushrooms for food for thousands of years.

Ex Output:

humans eat mushrooms.