question: what is disappearing rapidly?
choices.text: antigen ozone gas Type O air homes RNA oil
choices.label: A B C D E F G H
fact2: Ozone loss is rapid.
combinedfact: ozone is disappearing rapidly
formatted_question: what is disappearing rapidly? (A) antigen (B) ozone (C) gas (D) Type O (E) air (F) homes (G) RNA (H) oil