Question: when did the north korean nuclear program start
[{'answer': '1956', 'provenance': [{'wikipedia_id': '10373265', 'title': 'Timeline of the North Korean nuclear program', 'start_paragraph_id': 2, 'start_character': 83, 'end_paragraph_id': 2, 'end_character': 87, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '10373265', 'title': 'Timeline of the North Korean nuclear program', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 500, 'bleu_score': 0.7957119156704321, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7446011953262131372}, 'section': 'Section::::Abstract.'}]}]