Question: who did tom brady back up at michigan
[{'answer': 'Brian Griese', 'provenance': [{'wikipedia_id': '339841', 'title': 'Tom Brady', 'start_paragraph_id': 14, 'start_character': 174, 'end_paragraph_id': 14, 'end_character': 186, 'bleu_score': 1.0, 'section': 'Section::::College career.\n'}]}, {'provenance': [{'wikipedia_id': '339841', 'title': 'Tom Brady', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 1006, 'bleu_score': 0.974585799855568, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10321820180890906300}, 'section': 'Section::::College career.\n'}]}]