Question: when did the first machine gun come out
[{'answer': '1862', 'provenance': [{'wikipedia_id': '19690', 'title': 'Machine gun', 'start_paragraph_id': 30, 'start_character': 232, 'end_paragraph_id': 30, 'end_character': 236, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '19690', 'title': 'Machine gun', 'start_paragraph_id': 30, 'start_character': 0, 'end_paragraph_id': 30, 'end_character': 602, 'bleu_score': 0.979054689945215, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15183344100757196214}, 'section': 'Section::::History.\n'}]}]