Question: when was the last time ohio state won a national championship in football
[{'answer': '2014', 'provenance': [{'wikipedia_id': '6000172', 'title': 'Ohio State Buckeyes football', 'start_paragraph_id': 3, 'start_character': 1010, 'end_paragraph_id': 3, 'end_character': 1014, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]