Question: who's the starting quarterback for the vikings
[{'answer': 'Sam Bradford', 'provenance': [{'wikipedia_id': '10360015', 'title': 'List of Minnesota Vikings starting quarterbacks', 'start_paragraph_id': 7, 'start_character': 1986, 'end_paragraph_id': 7, 'end_character': 1998, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '10360015', 'title': 'List of Minnesota Vikings starting quarterbacks', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 553, 'bleu_score': 0.7820082238342071, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17692601875926637578}, 'section': 'Section::::Abstract.'}]}]