Question: who played in the 2015 college football national championship
[{'answer': 'Oregon Ducks', 'provenance': [{'wikipedia_id': '41580877', 'title': '2015 College Football Playoff National Championship', 'start_paragraph_id': 2, 'start_character': 206, 'end_paragraph_id': 2, 'end_character': 218, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Ohio State Buckeyes', 'provenance': [{'wikipedia_id': '41580877', 'title': '2015 College Football Playoff National Championship', 'start_paragraph_id': 2, 'start_character': 117, 'end_paragraph_id': 2, 'end_character': 136, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]