Question: when did the university of chicago leave the big ten
[{'answer': '1946', 'provenance': [{'wikipedia_id': '14997318', 'title': 'Chicago Maroons football', 'start_paragraph_id': 1, 'start_character': 754, 'end_paragraph_id': 1, 'end_character': 758, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14997318', 'title': 'Chicago Maroons football', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 940, 'bleu_score': 0.842124196029416, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17056065950741518097}, 'section': 'Section::::Abstract.'}]}]