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: Viruses cannot reproduce by themselves.

Output: Viruses reproduce.


Input: Consider Input: Fact: a greenhouse is used to protect plants from the cold.

Output: cold causes plants to die.


Input: Consider Input: Fact: an organism requires energy for growth.


Output: energy atp.