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: operating an automobile usually requires fossil fuels.

Ex Output:
automobile car.


Ex Input:
Fact: coal is used to produce electricity by burning in coal-fire power stations.

Ex Output:
Electricity is energy.


Ex Input:
Fact: Many nerve pathways link the cerebellum with motor neurons throughout the body.

Ex Output:

Cerebellum.