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: Female mammals have mammary glands.
female mammals.

Fact: Caffeine is an example of a psychoactive drug.
caffeine psychoactive.

Fact: Viruses are not affected by antibiotics.

Viruses smallpox.