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: using renewable resources to generate power reduces greenhouse gases.

Output: greenhouse gas carbon.


Input: Consider Input: Fact: Birds evolved from a group of bipedal dinosaurs called theropods.

Output: Birds evolved.


Input: Consider Input: Fact: Zooplankton are tiny animals that feed on phytoplankton.


Output: Zooplankton.