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: Behaviors can be learned through play.
Example Output: Behaviors.

Example Input: Fact: Climate influences plant growth, biodiversity, and adaptations of land organisms.
Example Output: biodiversity increases survival.

Example Input: Fact: when electricity flows to a light bulb , the light bulb will turn on.
Example Output:
electricity electrons.