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: having food has a positive impact on an organism 's health.
Example Output: food contains.

Example Input: Fact: Blood pH may become unbalanced if the rate of breathing is too fast or too slow.
Example Output: blood ph breathing.

Example Input: Fact: Viruses cannot reproduce by themselves.
Example Output:
Viruses reproduce.