Question: what is the oldest restaurant in the united states
[{'answer': 'Union Oyster House', 'provenance': [{'wikipedia_id': '3228741', 'title': 'Union Oyster House', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3228741', 'title': 'Union Oyster House', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 327, 'bleu_score': 0.8983343737277121, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18443414478464266681}, 'section': 'Section::::Abstract.'}]}]