question: america:san francisco
choices.label: A B C D
choices.text: korea:busan france:sahara germany:venice japan:honolulu
explanation: "san francisco" is part of "america". "busan" is an integral part of "korea". "sahara" is in northern africa, "sahara" is not part of "france". "venice" is part of italy, "venice" is not part of "germany". "honolulu" is part of the US, "honolulu" is not part of "japan".
relation: san francisco america R2.3
relation: busan korea R2.3