Question: who is the starting quarterback for the minnesota vikings this year
[{'answer': 'Case Keenum'}, {'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'}]}]