question: what uses friction for stopping with brakes?
choices.text: humans lynx cars oxygen people bumpers coyotes cows
choices.label: A B C D E F G H
fact2: Cars are vehicles and trucks are vehicles.
combinedfact: friction is used for stopping a car by brakes
formatted_question: what uses friction for stopping with brakes? (A) humans (B) lynx (C) cars (D) oxygen (E) people (F) bumpers (G) coyotes (H) cows