Question: who won the national championship in college football last year
[{'answer': 'Alabama', 'provenance': [{'wikipedia_id': '44628927', 'title': '2017 College Football Playoff National Championship', 'start_paragraph_id': 2, 'start_character': 187, 'end_paragraph_id': 2, 'end_character': 194, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '44628927', 'title': '2017 College Football Playoff National Championship', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 328, 'bleu_score': 0.8923575006167591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3225160853442065304}, 'section': 'Section::::Teams.\n'}]}]