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.

[EX Q]: Fact: Some viruses have an envelope of phospholipids and proteins.
[EX A]: envelope phospholipids and proteins.

[EX Q]: Fact: a beak is used for catching prey by some birds.
[EX A]: beak bill.

[EX Q]: Fact: sugar causes food to taste sweet.
[EX A]:
Sugar is raw cane.