Question: what is the main part of a city
[{'answer': 'city center or downtown', 'provenance': [{'wikipedia_id': '5391', 'title': 'City', 'start_paragraph_id': 15, 'start_character': 358, 'end_paragraph_id': 15, 'end_character': 381, 'bleu_score': 1.0, 'section': 'Section::::Geography.:Center.\n'}]}, {'provenance': [{'wikipedia_id': '5391', 'title': 'City', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 436, 'bleu_score': 0.970362113628587, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17689371838063411861}, 'section': 'Section::::Geography.:Center.\n'}]}]