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: Cell division is more complex in eukaryotes than prokaryotes.
Example Output: Cell division is.

Example Input: Fact: Roundworms reproduce sexually.
Example Output: reproduce their young.

Example Input: Fact: Adult tunicates are barrel-shaped.
Example Output:
adult tunicates.