Question: tallest building in the world of all time
[{'answer': 'Burj Khalifa', 'provenance': [{'wikipedia_id': '23569712', 'title': "History of the world's tallest buildings", 'start_paragraph_id': 1, 'start_character': 50, 'end_paragraph_id': 1, 'end_character': 62, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '23569712', 'title': "History of the world's tallest buildings", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 198, 'bleu_score': 0.7470395441458331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6767284878425926480}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '23569712', 'title': "History of the world's tallest buildings", 'start_paragraph_id': 24, 'start_character': 0, 'end_paragraph_id': 24, 'end_character': 246, 'bleu_score': 0.8302012483091991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6767284878425926480}, 'section': 'Section::::Tallest buildings (from 1908).\n'}]}, {'provenance': [{'wikipedia_id': '23569712', 'title': "History of the world's tallest buildings", 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6767284878425926480}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '166570', 'title': 'List of tallest structures', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The tallest structure in the world is the Burj Khalifa skyscraper at', 'The tallest structure in the world is the Burj Khalifa skyscraper at . Listed are guyed masts (such as telecommunication masts), self-supporting towers (such as the CN Tower), skyscrapers (such as the Willis Tower), oil platforms, electricity transmission towers, and bridge support towers.', 'The tallest structure in the world is the Burj Khalifa skyscraper at . Listed are guyed masts (such as telecommunication masts), self-supporting towers (such as the CN Tower), skyscrapers (such as the Willis Tower), oil platforms, electricity transmission towers, and bridge support towers.']}}]}, {'provenance': [{'wikipedia_id': '23569712', 'title': "History of the world's tallest buildings", 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The tallest building in the world, as of 2020, is Burj Khalifa', 'The tallest building in the world, as of 2020, is Burj Khalifa.', 'The tallest building in the world, as of 2020, is Burj Khalifa. The title of "world\'s tallest building" has been borne by various buildings, such as the Rouen Cathedral and the Empire State Building.']}}]}, {'provenance': [{'wikipedia_id': '13538796', 'title': 'List of tallest buildings in the United Arab Emirates', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['s in the UAE based on official height. The tallest building in United Arab Emirates is Burj Khalifa, which rises and contains 163 floors.', 'The tallest building in United Arab Emirates is Burj Khalifa, which rises and contains 163 floors', 'This list of tallest buildings in the United Arab Emirates ranks skyscrapers in the UAE based on official height. The tallest building in United Arab Emirates is Burj Khalifa, which rises and contains 163 floors.']}}]}]