Question: who won the ncaa football championship in 2018
[{'answer': 'Alabama Crimson Tide', 'provenance': [{'wikipedia_id': '48966894', 'title': '2018 College Football Playoff National Championship', 'start_paragraph_id': 1, 'start_character': 199, 'end_paragraph_id': 1, 'end_character': 219, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]