question: What is used to smooth drum sticks?
choices.text: scratching it keratin tiny hairs hard tissue drums sandpaper ice dirt
choices.label: A B C D E F G H
fact2: Drum sticks are of wooden cane.
combinedfact: sandpaper is used to smooth drum sticks
formatted_question: What is used to smooth drum sticks? (A) scratching it (B) keratin (C) tiny hairs (D) hard tissue (E) drums (F) sandpaper (G) ice (H) dirt