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: a telephone is used for communication by humans over long distances.
[EX A]: communication convey.

[EX Q]: Fact: Antigens are found on cancer cells and the cells of transplanted organs.
[EX A]: antigen cancer.

[EX Q]: Fact: building housing developments usually requires replacing animal habitats.
[EX A]:
animal habitats.