question: What is used by canines to warn others?
choices.text: antibodies panting noise vibration Chemicals howling lamphreys hunting
choices.label: A B C D E F G H
fact2: Gray wolves are the largest members of the canine family.
combinedfact: howling is used by canines to warn others
formatted_question: What is used by canines to warn others? (A) antibodies (B) panting (C) noise (D) vibration (E) Chemicals (F) howling (G) lamphreys (H) hunting