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.

Input: Consider Input: Fact: Petals attract pollinators to the flower.

Output: bird pollinator.


Input: Consider Input: Fact: Viruses are not cells.

Output: Viruses.


Input: Consider Input: Fact: using renewable resources to generate power reduces greenhouse gases.


Output: greenhouse gas carbon.