Question: the fast pace growth of cities is called
[{'answer': 'Urbanization', 'provenance': [{'wikipedia_id': '56114', 'title': 'Urbanization', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '56114', 'title': 'Urbanization', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 839, 'bleu_score': 0.983401048538667, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11880576904734944227}, 'section': 'Section::::Abstract.'}]}]