question: car:fuel
choices.label: A B C D
choices.text: bread:wheat aircraft:parts plant:sunshine cake:oven
explanation: the "car" is powered by "fuel", and the power source of the "car" is "fuel". "bread" is made from the flour processed from "wheat". an "aircraft" is devided into small "parts". "plants" need "sunlight" to provide energy for growth, and "sunlight" is the source of power for "plants". "cake" is baked in an "oven", which is inconsistent with the way the title corresponds.
relation: fuel car R3.10
relation: wheat bread R3.10
relation: parts aircraft R2.3
relation: sunshine plant R3.10
relation: oven cake R3.10