Question: when was the grand hotel on mackinac island built
[{'answer': '1887', 'provenance': [{'wikipedia_id': '3399155', 'title': 'Grand Hotel (Mackinac Island)', 'start_paragraph_id': 4, 'start_character': 555, 'end_paragraph_id': 4, 'end_character': 559, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]