question: forest:trees
choices.label: A B C D
choices.text: building complex:buildings creature:animal food:milk computer:hard disk
explanation: "trees" are part of and the basic consituting elements of a "forest". "building" is a part of and the basic consituting element of the "building complex". "animal" is a kind of "creature" and is not the basic constituting element of "creature". "milk" is a kind of "food" and is not the basic constituting element of "food". a "hard disk" is a component of a "computer", but a "computer" is not made up of many "hard disks".
relation: trees forest R2.3