Question: when was the signature at mgm grand built
[{'answer': 'October 2004', 'provenance': [{'wikipedia_id': '4050480', 'title': 'The Signature at MGM Grand', 'start_paragraph_id': 7, 'start_character': 3, 'end_paragraph_id': 7, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '4050480', 'title': 'The Signature at MGM Grand', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 498, 'bleu_score': 0.9346183847893801, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6958063363772466864}, 'section': 'Section::::History.\n'}]}]