Question: what is the talkest building in the world
[{'answer': 'Burj Khalifa in Dubai', 'provenance': [{'wikipedia_id': '338344', 'title': 'List of tallest buildings', 'start_paragraph_id': 5, 'start_character': 333, 'end_paragraph_id': 5, 'end_character': 354, 'bleu_score': 1.0, 'section': 'Section::::Ranking criteria and alternatives.\n'}]}, {'provenance': [{'wikipedia_id': '338344', 'title': 'List of tallest buildings', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 539, 'bleu_score': 0.788500553647268, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17224021188929052012}, 'section': 'Section::::Ranking criteria and alternatives.\n'}]}]