question: What does smog contain?
choices.text: scales or plates nuclear waste dust particles Decaying vegetation keratin microorganisms information physical properties
choices.label: A B C D E F G H
formatted_question: What does smog contain? (A) scales or plates (B) nuclear waste (C) dust particles (D) Decaying vegetation (E) keratin (F) microorganisms (G) information (H) physical properties