question: principal:teacher
choices.label: A B C D
choices.text: police:thief manager:staff teacher:student doctor:nurse
explanation: the "principal" is the boss of "teachers", and "teachers" are managed by the "principal". a "police" can catch a "thief", and a "police" is not the boss of a "thief". the "manager" is the boss of a "staff", and the "staff" is managed by the "manager". "teachers" educate "student". "student" are not the subordinates of "teachers", and "teachers" are not the bosses of "students". the "nurse" cooperates with the "doctor" to treat patients, and the "doctor" is not the boss of the "nurse".
relation: principal teacher R3.10
relation: manager staff R3.10