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.

Fact: Caffeine is a central nervous system stimulant.
caffeine coffee.

Fact: All plants have a characteristic life cycle that includes alternation of generations.
alternation generations.

Fact: bees convert nectar into honey.

Flower nectar.