Question: what team was case keenum on before the vikings
[{'answer': 'St. Louis Rams', 'provenance': [{'wikipedia_id': '14808650', 'title': 'Case Keenum', 'start_paragraph_id': 2, 'start_character': 245, 'end_paragraph_id': 2, 'end_character': 259, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14808650', 'title': 'Case Keenum', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 917, 'bleu_score': 0.8664908462463811, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9622452679499146164}, 'section': 'Section::::Abstract.'}]}]