Question: when was the last time a nuclear bomb was detonated
[{'answer': 'September 2017', 'provenance': [{'wikipedia_id': '337775', 'title': 'Nuclear weapons testing', 'start_paragraph_id': 4, 'start_character': 590, 'end_paragraph_id': 4, 'end_character': 604, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '337775', 'title': 'Nuclear weapons testing', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 619, 'bleu_score': 0.9305040738174791, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16214716669470039228}, 'section': 'Section::::Abstract.'}]}]