Question: first black chairman of joint chiefs of staff
[{'answer': 'Colin Luther Powell', 'provenance': [{'wikipedia_id': '6984', 'title': 'Colin Powell', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6984', 'title': 'Colin Powell', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 643, 'bleu_score': 0.722830922077854, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8111314607148879534}, 'section': 'Section::::Abstract.'}]}]