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: Sponges have specialized cells called collar cells.
Example Output: collar cell.

Example Input: Fact: Hagfish are noted for secreting large amounts of thick, slimy mucus.
Example Output: hagfish ancient.

Example Input: Fact: disease-causing microbes have a negative impact on the body.
Example Output:
Microbes are.