question: smog:pollution:treatment
choices.label: A B C D
choices.text: fan:electrical appliance:use japonica rice:grain:investigation information:newspapers:read report:document:procedure for examination and approval
explanation: "smog" is a kind of "pollution", and "pollution" needs "governance". "fan" is a kind of "electrical appliance", and "fan" is "used" by people. "grain" includes "japonica rice", and there is no obvious logical relationship between "investigation" and "grain". "information" is the carrier of "newspaper", "information" is not a kind of "newspaper" "report" can be "document" and "document" can also be "report"
relation: smog pollution R2.2
relation: pollution treatment R4.2
relation: fan electrical appliance R2.2
relation: electrical appliance use R4.2
relation: investigation grain R4.2
relation: newspapers information R3.10
relation: report document R2.7