Question: who was the mayor during the detroit riots
[{'answer': 'Mayor Jerome Cavanagh', 'provenance': [{'wikipedia_id': '319973', 'title': '1967 Detroit riot', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Chronology.:Sunday, July 23.\n'}]}, {'provenance': [{'wikipedia_id': '319973', 'title': '1967 Detroit riot', 'start_paragraph_id': 27, 'start_character': 0, 'end_paragraph_id': 27, 'end_character': 446, 'bleu_score': 0.9748377259086851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5479400042386993607}, 'section': 'Section::::Chronology.:July 26–27.\n'}]}]