Question: when did they start building the new world trade center
[{'answer': 'April 27 , 2006', 'provenance': [{'wikipedia_id': '5002871', 'title': 'One World Trade Center', 'start_paragraph_id': 2, 'start_character': 249, 'end_paragraph_id': 2, 'end_character': 264, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5002871', 'title': 'One World Trade Center', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 830, 'bleu_score': 0.9305341767710501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12048978086518644049}, 'section': 'Section::::Abstract.'}]}]