Question: when was the last time the chicago bears won a superbowl
[{'answer': '1985', 'provenance': [{'wikipedia_id': '6611', 'title': 'Chicago Bears', 'start_paragraph_id': 22, 'start_character': 130, 'end_paragraph_id': 22, 'end_character': 134, 'bleu_score': 1.0, 'section': 'Section::::Franchise history.:1950s–1968: Late-Halas era.\n'}]}]