question: forest:trees
choices.label: A B C D
choices.text: school:university university of oxford:department of  computer science, university of oxford university:university of oxford oxford university:students at oxford
explanation: "trees" are part of the "forest". "university" belongs to "school". "university" is not part of "school". "department of  computer science, university of oxford" is a part of "university of oxford", and there are other departments in "university of oxford". "university of oxford" belongs to "universities". "students at oxford" are parts of "university of oxford".
relation: trees forest R2.3
relation: university school R2.2
relation: department of  computer science, university of oxford oxford university R2.3
relation: oxford university university R2.2
relation: students at oxford oxford university R2.3