Question: who played king arthur in once upon a time
[{'answer': 'Liam Thomas Garrigan', 'provenance': [{'wikipedia_id': '27855595', 'title': 'Liam Garrigan', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '27855595', 'title': 'Liam Garrigan', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 415, 'bleu_score': 0.8204369627071021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5975330786734374687}, 'section': 'Section::::Abstract.'}]}]