instruction:
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.
question:
Fact: a refrigerator is used for keeping food fresh for a long period of time.
answer:
food chicken.


question:
Fact: Placental mammals are the dominant land mammals.
answer:
Placental mammals.


question:
Fact: cycles of freezing and thawing water cause ice wedging.
answer:

freezing thawing ice.