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: Viruses often infect bacteria.

Ex Output:
bacteria define.


Ex Input:
Fact: microorganisms can cause infections.

Ex Output:
infection.


Ex Input:
Fact: Fertilization occurs when a sperm and an egg fuse.

Ex Output:

Sex Fertilization.