question: oil painting:turpentine
choices.label: A B C D
choices.text: portraits:film calligraphy:frame brush:ink ivory carving:ivory
explanation: "turpentine" is the raw material of "oil painting". a "portrait" can be presented by a "film". "framing" needs "calligraphy" works. "ink" requires a "brush" to be dipped in it for writing. "ivory" is the raw material of "ivory carving".
relation: oil painting turpentine R3.7
relation: ivory carving ivory R3.7