Question: when was the wizard of oz first released
[{'answer': 'August 25 , 1939', 'provenance': [{'wikipedia_id': '561315', 'title': 'The Wizard of Oz (1939 film)', 'start_paragraph_id': 100, 'start_character': 507, 'end_paragraph_id': 100, 'end_character': 523, 'bleu_score': 1.0, 'section': 'Section::::Release.\n'}]}]