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: Invertebrates are animals that lack a vertebral column, or backbone.

Output: Invertebrate.


Input: Consider Input: Fact: eyes are used for seeing by animals by sensing light.

Output: animal mammals.


Input: Consider Input: Fact: threatening behavior causes a fight-or-flight response in animals.


Output: animal animalia members.