Question: who did the broncos play in their last super bowl
[{'answer': 'Carolina Panthers', 'provenance': [{'wikipedia_id': '8122', 'title': 'Denver Broncos', 'start_paragraph_id': 24, 'start_character': 307, 'end_paragraph_id': 24, 'end_character': 324, 'bleu_score': 1.0, 'section': 'Section::::Franchise history.:1999–2011: Post-Elway era.\n'}]}, {'provenance': [{'wikipedia_id': '8122', 'title': 'Denver Broncos', 'start_paragraph_id': 31, 'start_character': 0, 'end_paragraph_id': 31, 'end_character': 1375, 'bleu_score': 0.841820229450132, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2146817412109373470}, 'section': "Section::::Franchise history.:2012–2015: Peyton Manning era.:2015: Super Bowl 50 Champions and Manning's Final Season.\n"}]}]