question: tires:car
choices.label: A B C D
choices.text: glass:house computer:console joystick:aircraft fruit:tree
explanation: "tires" are part of a "car". the "glass" is not necessarily in the "house". the "computer" doesn't have to be on the “console". the "joystick" is part of the "aircraft". the "fruit" is not necessarily on the "tree".
relation: tires car R2.3
relation: joystick aircraft R2.3