Question: Which Ukrainian-born American ballet dancer is remembered for his long association with a musical based on Lynn Riggs' 1931 play, "Green Grow the Lilacs"?
{'answer': 'Vladimir Kostenko', 'supporting_facts': [['Vladimir Kostenko', 0], ['Vladimir Kostenko', 1], ['Oklahoma!', 0], ['Oklahoma!', 1], ['Oklahoma!', 2]]}