question: computer:motherboard
choices.label: A B C D
choices.text: desk calendar:wall calendar fruit:apple film:camera house:foundation
explanation: a "computer" cannot run without a "motherboard", which is a necessary condition for a "computer". both the "desk calendar" and the "wall calendar" are calendars. "apple" is a "fruit". "film" and "camera" are used together. the "foundation" is the foundation of the "house" and plays a very important role in the firmness and durability of the building. without the "foundation", there will not be a "house", and the "foundation" is a necessary condition for the "house".
relation: motherboard computer R5.4
relation: desk calendar wall calendar R2.4
relation: apple fruit R2.2
relation: film camera R3.10
relation: foundation house R5.4