Question: what was the first national park in the us
[{'answer': 'Yellowstone', 'provenance': [{'wikipedia_id': '21355232', 'title': 'List of national parks of the United States', 'start_paragraph_id': 1, 'start_character': 275, 'end_paragraph_id': 1, 'end_character': 286, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '21355232', 'title': 'List of national parks of the United States', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1205, 'bleu_score': 0.719354438360649, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1336527486731965623}, 'section': 'Section::::Abstract.'}]}]