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: Introns are regions that do not code for proteins.
Example Output: introns DNA.

Example Input: Fact: Mating is generally preceded by courtship.
Example Output: animal courtship.

Example Input: Fact: Macroevolution is evolution over geologic time above the level of the species.
Example Output:
Macroevolution.