Question: which is the smallest national park in the world
[{'answer': 'Mill Ends Park', 'provenance': [{'wikipedia_id': '600846', 'title': 'Mill Ends Park', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '600846', 'title': 'Mill Ends Park', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 435, 'bleu_score': 0.833447038374957, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16085525362068823543}, 'section': 'Section::::Abstract.'}]}]