Question: who played the scarecrow in the wizard of oz 1939
[{'answer': 'Ray Bolger', 'provenance': [{'wikipedia_id': '561315', 'title': 'The Wizard of Oz (1939 film)', 'start_paragraph_id': 1, 'start_character': 469, 'end_paragraph_id': 1, 'end_character': 479, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]