Question: who won the national championship in football last year
[{'answer': 'Clemson Tigers', 'provenance': [{'wikipedia_id': '44628927', 'title': '2017 College Football Playoff National Championship', 'start_paragraph_id': 2, 'start_character': 106, 'end_paragraph_id': 2, 'end_character': 120, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]