choices.label: A B C D
choices.text: desk:book learning:responsibility printer:printing paper electric light:wire
explanation: "fire extinguisher"s need to use "dry powder" to put out fire. "books" can be placed on "desks", and "desks" do not need to use "books" to play a load-bearing role. there is no obvious logical relationship between "learning" and "responsibility". "printer" needs to use "printing paper" to print. "electric light" and "wire" need to be used together.
relation: fire extinguisher dry powder R3.5
relation: printer printing paper R3.5
relation: electric light wire R3.10