Question: who invented the first practical electric light bulb
[{'answer': 'Thomas Alva Edison', 'provenance': [{'wikipedia_id': '29778', 'title': 'Thomas Edison', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '29778', 'title': 'Thomas Edison', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 690, 'bleu_score': 0.5472861137169991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11940871537153433571}, 'section': 'Section::::Abstract.'}]}]