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: sound can be used for communication by animals.
answer:
Sound is frequency.


question:
Fact: pesticides can cause pollution.
answer:
pesticides are.


question:
Fact: exercise increases a body 's strength.
answer:

body strength keeps healthy.