Question: who killed fergus in once upon a time
[{'answer': 'Arthur', 'provenance': [{'wikipedia_id': '47993840', 'title': 'The Bear King', 'start_paragraph_id': 2, 'start_character': 55, 'end_paragraph_id': 2, 'end_character': 61, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '47993840', 'title': 'The Bear King', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 2036, 'bleu_score': 0.995043332357995, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11293402921982352317}, 'section': "Section::::Plot.:In the Character's Past.\n"}]}]