Question: Reima Juhani Karppinen won a silver medal at what event that was held from August 30 to September 6 in 1981, at Oberschleibheim, outside Munich, Germany?
Sentence (from "Akiko Iwamoto"): Akiko Iwamoto (岩本 亜希子 , Iwamoto Akiko , born September 25, 1978) is a Japanese rower.
Relevant evidence: No