Question: when was the first helicopter made and flown
[{'answer': '1936', 'provenance': [{'wikipedia_id': '8286923', 'title': 'Helicopter', 'start_paragraph_id': 3, 'start_character': 146, 'end_paragraph_id': 3, 'end_character': 150, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8286923', 'title': 'Helicopter', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 853, 'bleu_score': 0.9651324673660481, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13521432159294470093}, 'section': 'Section::::Abstract.'}]}]