Question: how much money did the twin towers cost
[{'answer': '$400 million', 'provenance': [{'wikipedia_id': '45645094', 'title': 'World Trade Center (1973–2001)', 'start_paragraph_id': 2, 'start_character': 71, 'end_paragraph_id': 2, 'end_character': 82, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '45645094', 'title': 'World Trade Center (1973–2001)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 468, 'bleu_score': 0.563503193728059, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9324806703420890110}, 'section': 'Section::::Abstract.'}]}]