Question: when was the first mobile phone sold to the public
[{'answer': '1979', 'provenance': [{'wikipedia_id': '1245539', 'title': 'History of mobile phones', 'start_paragraph_id': 49, 'start_character': 90, 'end_paragraph_id': 49, 'end_character': 94, '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': 49, 'start_character': 0, 'end_paragraph_id': 49, 'end_character': 174, 'bleu_score': 0.8634982146929601, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12522824670193239474}, 'section': 'Section::::The early generations.:1G – Analog cellular.\n'}]}]