Given a statement and question, generate the answer to the question such that the answer is contained in the statement.

statement: pollution contains matter suspended in air, question: What is suspended in the air?
matter

statement: Vehicle brakes rely on the tire traction to reduce speed, question: What do brakes use to reduce speed?
tire traction

statement: Travelling requires people knowing where they are., question: What requires people to know where they are?

Travelling