Question: when were cell phones first introduced to the public
[{'answer': '13 October 1983', 'provenance': [{'wikipedia_id': '1245539', 'title': 'History of mobile phones', 'start_paragraph_id': 50, 'start_character': 161, 'end_paragraph_id': 50, 'end_character': 176, 'bleu_score': 1.0, 'section': 'Section::::The early generations.:1G – Analog cellular.\n'}]}, {'provenance': [{'wikipedia_id': '1245539', 'title': 'History of mobile phones', 'start_paragraph_id': 50, 'start_character': 0, 'end_paragraph_id': 50, 'end_character': 608, 'bleu_score': 0.9553520562799491, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9991105995035696502}, 'section': 'Section::::The early generations.:1G – Analog cellular.\n'}]}]