question: spinal cord:nervous system
choices.label: A B C D
choices.text: geometry:planar graphs loneliness:idleness court:state organ mountains and rivers:picturesque
explanation: the "spinal cord" is part of the "nervous system". "planar graphs" belong to the research range of "geometry", which is not a part of "planar graphs". "loneliness" describes being alone and solitary, and "idleness" describes the state of doing nothing. "idleness" may give rise to "loneliness", and "loneliness" is not part of "idleness". the "court" belongs to the state judicial organ. "state organs" include the power organ, the judicial organ, etc. the "court" is a part of the "state organ". "mountains and rivers" are "picturesque".
relation: planar graphs geometry R3.10
relation: idleness loneliness R3.10
relation: picturesque mountains and rivers R4.3