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: Smog contains particulates.
answer:
particulates air.


question:
Fact: sandpaper is used to smooth wooden objects.
answer:
Wooden object.


question:
Fact: Scales protect fish from predators and parasites and reduce friction with the water.
answer:

Friction is the force resisting.