question: Sulfur dioxide is a common component of what?
choices.text: plant respiration coal smog air HCl rain photosynthesis plants
choices.label: A B C D E F G H
formatted_question: Sulfur dioxide is a common component of what? (A) plant respiration (B) coal (C) smog (D) air (E) HCl (F) rain (G) photosynthesis (H) plants