Question: who has won the most national championships in college football history
[{'answer': 'Princeton', 'provenance': [{'wikipedia_id': '17278765', 'title': 'College football national championships in NCAA Division I FBS', 'start_paragraph_id': 7, 'start_character': 280, 'end_paragraph_id': 7, 'end_character': 289, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]