question: What are electrical in nature?
choices.text: a camera physical properties dragonflies brain signals VOCs and NOx FM systems suspension bridges backbones
choices.label: A B C D E F G H
formatted_question: What are electrical in nature? (A) a camera (B) physical properties (C) dragonflies (D) brain signals (E) VOCs and NOx (F) FM systems (G) suspension bridges (H) backbones