Question: who plays in the big 12 football championship
[{'answer': 'Oklahoma Sooners', 'provenance': [{'wikipedia_id': '8007006', 'title': 'Big 12 Championship Game', 'start_paragraph_id': 6, 'start_character': 119, 'end_paragraph_id': 6, 'end_character': 135, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'TCU Horned Frogs'}]