Question: when did stoke on trent become a city
[{'answer': '1910 .', 'provenance': [{'wikipedia_id': '173333', 'title': 'Stoke-on-Trent', 'start_paragraph_id': 2, 'start_character': 75, 'end_paragraph_id': 2, 'end_character': 83, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '173333', 'title': 'Stoke-on-Trent', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 324, 'bleu_score': 0.9632870032952191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11872046131152614806}, 'section': 'Section::::Abstract.'}]}]