Question: when was the first portable cell phone invented
[{'answer': '1965', 'provenance': [{'wikipedia_id': '1245539', 'title': 'History of mobile phones', 'start_paragraph_id': 10, 'start_character': 3, 'end_paragraph_id': 10, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::Predecessors.\n'}]}, {'provenance': [{'wikipedia_id': '1245539', 'title': 'History of mobile phones', 'start_paragraph_id': 10, 'start_character': 0, 'end_paragraph_id': 10, 'end_character': 336, 'bleu_score': 0.753641048101322, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2617845255589310199}, 'section': 'Section::::Predecessors.\n'}]}]