Question: when did the first wizard of oz come out
[{'answer': '1939', 'provenance': [{'wikipedia_id': '561315', 'title': 'The Wizard of Oz (1939 film)', 'start_paragraph_id': 0, 'start_character': 18, 'end_paragraph_id': 0, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '561315', 'title': 'The Wizard of Oz (1939 film)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 505, 'bleu_score': 0.6455558815879161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10029914360960141667}, 'section': 'Section::::Abstract.'}]}]