Question: how long was the empire state building the tallest building
[{'answer': 'nearly 40 years', 'provenance': [{'wikipedia_id': '9736', 'title': 'Empire State Building', 'start_paragraph_id': 1, 'start_character': 586, 'end_paragraph_id': 1, 'end_character': 601, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '9736', 'title': 'Empire State Building', 'start_paragraph_id': 1, 'start_character': 186, 'end_paragraph_id': 1, 'end_character': 850, 'bleu_score': 0.525660737338781, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17561063115749079650}, 'section': 'Section::::Abstract.'}]}]