Question: who was the first african american quarterback to win a superbowl
[{'answer': 'Douglas Lee Williams', 'provenance': [{'wikipedia_id': '1078824', 'title': 'Doug Williams (quarterback)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1078824', 'title': 'Doug Williams (quarterback)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 761, 'bleu_score': 0.8371470198693001, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14717891305204215032}, 'section': 'Section::::Abstract.'}]}]