Question: what is the tallest building in the united states
[{'answer': 'One World Trade Center', 'provenance': [{'wikipedia_id': '334804', 'title': 'List of tallest buildings in the United States', 'start_paragraph_id': 2, 'start_character': 31, 'end_paragraph_id': 2, 'end_character': 53, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '334804', 'title': 'List of tallest buildings in the United States', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 564, 'bleu_score': 0.54430949439536, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3192070403991017724}, 'section': 'Section::::Abstract.'}]}]