question: horn:comb
choices.label: A B C D
choices.text: steel plate:ore corn:gasoline air:oxygen egg:sesame oil
explanation: the material of the horn comb is "horn", and the horn comb belongs to "comb". there is no obvious logical relationship between "steel plate" and "ore". ethanol gasoline is made from "corn" through fermentation, and ethanol gasoline belongs to "gasoline". "oxygen" is part of "air". there is no obvious logical relationship between "egg" and "sesame oil", they are both edible.
relation: horn comb R3.7
relation: corn gasoline R3.7
relation: air oxygen R2.3