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: Adult sponges are sessile.

Output: sessile immobile.


Input: Consider Input: Fact: Nerve impulses are electrical in nature.

Output: Nerve impulses are electrical in nature.


Input: Consider Input: Fact: Antibodies are large, Y-shaped proteins that recognize and bind to antigens.


Output: Antibodies.