Question: who plays king fergus in once upon a time
[{'answer': 'Glenn Keogh', 'provenance': [{'wikipedia_id': '47993840', 'title': 'The Bear King', 'start_paragraph_id': 22, 'start_character': 1040, 'end_paragraph_id': 22, 'end_character': 1051, 'bleu_score': 1.0, 'section': 'Section::::Reception.\n'}]}]