Question: in what city was the band iron butterfly initially formed
[{'answer': 'San Diego , California', 'provenance': [{'wikipedia_id': '177667', 'title': 'Iron Butterfly', 'start_paragraph_id': 1, 'start_character': 204, 'end_paragraph_id': 1, 'end_character': 226, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '177667', 'title': 'Iron Butterfly', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 650, 'bleu_score': 0.930928093778949, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11694700857435908209}, 'section': 'Section::::Abstract.'}]}]