question: petroleum:gasoline
choices.label: A B C D
choices.text: iron ore:steel wood:furniture cement:house glass:windows
explanation: "petroleum" is the raw material of "gasoline", and "gasoline" can be obtained by refining "petroleum". "iron ore" is the raw material of "steel", and "steel" can be obtained by refining "iron ore". "wood" is the raw material of "furniture", and "furniture" cannot be obtained by refining "wood". "cement" is the raw material of "house", and "house" cannot be obtained by refining "cement". "glass" is a component of "windows", and "windows" cannot be obtained by refining "glass".
relation: gasoline petroleum R3.7
relation: steel iron ore R3.7
relation: furniture wood R3.7
relation: house cement R3.7
relation: glass windows R2.3