Question: who has won the most college football national champions
[{'answer': 'Princeton'}, {'provenance': [{'wikipedia_id': '17278765', 'title': 'College football national championships in NCAA Division I FBS', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3096382253939496850}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '30863982', 'title': 'Big Three (colleges)', 'section': 'Section::::As an athletic association.\n', 'start_paragraph_id': 21, 'end_paragraph_id': 21, 'meta': {'evidence_span': ['In 25 seasons spanning 1869 through the 1894 title for the University of Pennsylvania, the consensus national champion was either Princeton (16 titles), Yale (13) or Harvard (2). Football between Harvard and Yale was suspended for two years after the 1894 game in Springfield, Massachusetts was so violent that it was referred to as "The Springfield Massacre."', 'In 25 seasons spanning 1869 through the 1894 title for the University of Pennsylvania, the consensus national champion was either Princeton (16 titles), Yale (13) or Harvard (2).']}}]}]