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: Caffeine is an example of a psychoactive drug.
Example Output: caffeine psychoactive.

Example Input: Fact: Lions live in social groups called prides.
Example Output: Lion.

Example Input: Fact: Reproduction is the process by which organisms give rise to offspring.
Example Output:
human organisms.