Question: how many african-american head coaches in the nfl
[{'answer': '5'}, {'provenance': [{'wikipedia_id': '3450770', 'title': 'Rooney Rule', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 321, 'bleu_score': 0.6856093224816121, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13636550046454191584}, 'section': 'Section::::Application.\n'}]}]