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: Organs of excretion make up the excretory system.

Output: Organs of excretion kidney.


Input: Consider Input: Fact: unequal heating of Earth 's surface by the Sun causes global wind patterns.

Output: earth our planet.


Input: Consider Input: Fact: the movement of tectonic plates causes volcanic eruptions.


Output: Volcanic eruptions can cool the earth.