Question: when did the vikings last play on thanksgiving
[{'answer': '2016', 'provenance': [{'wikipedia_id': '7931622', 'title': 'NFL on Thanksgiving Day', 'start_paragraph_id': 74, 'start_character': 333, 'end_paragraph_id': 74, 'end_character': 337, 'bleu_score': 1.0, 'section': 'Section::::Game MVPs.:Galloping Gobbler / Game Ball (Fox).\n'}]}]