Question: where did the chicago bulls play before the united center
[{'answer': 'Chicago Stadium', 'provenance': [{'wikipedia_id': '760001', 'title': 'Chicago Stadium', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '760001', 'title': 'Chicago Stadium', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 220, 'bleu_score': 0.8815741981066071, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18040691123980707847}, 'section': 'Section::::Abstract.'}]}]