question: What is the softest mineral used in?
choices.text: Pencil lead Glass Reduced friction Making rings Making ink keratin bone remodeling the nail
choices.label: A B C D E F G H
formatted_question: What is the softest mineral used in? (A) Pencil lead (B) Glass (C) Reduced friction (D) Making rings (E) Making ink (F) keratin (G) bone remodeling (H) the nail