choices.label: A B C D
choices.text: sorghum:wheat:automobile steel:bridge:railroad wheat:flour:bread paddy:rice:subsistence
explanation: the raw material of "paper" is "wood", and the raw material of "book" is "paper". grain includes "sorghum" and "wheat", the raw material of "wheat" is not "sorghum", and the raw material of "automobile" is not "wheat". the raw material for building "bridges" is "steel", and "railroads" can be laid on "bridges", but the raw materials for "railroads" are not "bridges". the raw material for making "flour" is "wheat", and the raw material for making "bread" is "flour". the raw material of "rice" is "paddy", and "rice" can solve the problem of "subsistence", but the raw material of "subsistence" is not "rice".
relation: wood paper R3.7
relation: paper book R3.7
relation: sorghum wheat R2.4
relation: steel bridge R3.7
relation: railroad bridge R3.10
relation: wheat flour R3.7
relation: flour bread R3.7
relation: paddy rice R3.7
relation: rice subsistence R3.10