Question: when did the smoky mountains become a national park
[{'answer': '1940', 'provenance': [{'wikipedia_id': '365553', 'title': 'Great Smoky Mountains National Park', 'start_paragraph_id': 1, 'start_character': 717, 'end_paragraph_id': 1, 'end_character': 721, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '365553', 'title': 'Great Smoky Mountains National Park', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 721, 'bleu_score': 0.8324639236387731, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4938169142778599765}, 'section': 'Section::::Abstract.'}]}]