Question: who did the vikings lose to in the 2017 season
[{'answer': 'Pittsburgh Steelers'}, {'answer': 'Detroit Lions', 'provenance': [{'wikipedia_id': '52195963', 'title': '2017 Minnesota Vikings season', 'start_paragraph_id': 15, 'start_character': 23, 'end_paragraph_id': 15, 'end_character': 36, 'bleu_score': 1.0, 'section': 'Section::::Regular season.:Game summaries.:Week 8: at Cleveland Browns.\n'}]}, {'answer': 'Carolina Panthers'}]