question: Which muscle is the agonist when straightening your elbow?
choices.text: crucial Two pairs Cynodonts therapsids therian mammary triceps keratin
choices.label: A B C D E F G H
formatted_question: Which muscle is the agonist when straightening your elbow? (A) crucial (B) Two pairs (C) Cynodonts (D) therapsids (E) therian (F) mammary (G) triceps (H) keratin