question: thanksgiving day:eating turkey
choices.label: A B C D
choices.text: history:reference clay:sand sunday:off order:obey
explanation: "eating turkey" is the main activity of "thanksgiving day". "history" has the function of providing "reference", but the main activity of "history" is not "reference". "clay" and "sand" belong to two different materials, and the main activity of "clay" is not "sand". "sunday" is one day of the weekends, and the main activity of "sunday" is taking a day "off". "order" "obedience", and the main activity of "order" is not "obeying".
relation: thanksgiving day eating turkey R3.10
relation: history reference R3.3
relation: clay sand R2.4
relation: sunday off R3.10
relation: obey order R4.2