Question: who is the current starting quarterback for the minnesota vikings
[{'answer': 'Case Keenum'}, {'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': 0.930981356847085, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5108630388487442082}, 'section': 'Section::::Abstract.'}]}]