Question: how many times has oklahoma state won the national championship
[{'answer': '1', 'provenance': [{'wikipedia_id': '7958137', 'title': 'Oklahoma State Cowboys football', 'start_paragraph_id': 1, 'start_character': 145, 'end_paragraph_id': 1, 'end_character': 146, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]