question: What is used to remove roughness?
choices.text: cartilage keratin hard tissue sandpaper scales ice lamphreys fluid
choices.label: A B C D E F G H
fact2: Pavement smoothness is a lack of roughness.
combinedfact: sandpaper is used to remove roughness
formatted_question: What is used to remove roughness? (A) cartilage (B) keratin (C) hard tissue (D) sandpaper (E) scales (F) ice (G) lamphreys (H) fluid