Question: who invented the first efficient incandescent light bulb that was later used in projectors
[{'answer': 'Thomas Edison', 'provenance': [{'wikipedia_id': '47139', 'title': 'Incandescent light bulb', 'start_paragraph_id': 8, 'start_character': 173, 'end_paragraph_id': 8, 'end_character': 186, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '47139', 'title': 'Incandescent light bulb', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 510, 'bleu_score': 0.9754554449993441, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7628284736729143340}, 'section': 'Section::::History.\n'}]}]