Question: who was the first black quarter back in nfl
[{'answer': 'Harris', 'provenance': [{'wikipedia_id': '1081997', 'title': 'James Harris (quarterback)', 'start_paragraph_id': 0, 'start_character': 6, 'end_paragraph_id': 0, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1081997', 'title': 'James Harris (quarterback)', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 910, 'bleu_score': 0.8675977775548761, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13569433886972656492}, 'section': 'Section::::Professional football career.:Buffalo Bills.\n'}]}]