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.

Example Input: Fact: Fertilization occurs when sperm swim to an egg inside an archegonium.
Example Output: Fertilization fuse.

Example Input: Fact: bees convert nectar into honey.
Example Output: Flower nectar.

Example Input: Fact: when sound reaches the ear , that sound can be heard.
Example Output:
hear sounds.