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.

Example Input: Fact: Cancer is a disease in which cells divide out of control.
Example Output: Cancer is cause of death.

Example Input: Fact: Muscles can only contract.
Example Output: contract leg.

Example Input: Fact: satellites are used to take images from space.
Example Output:
images from space.