Question: who plays king arthur in king arthur legend of the sword
[{'answer': 'Charlie Hunnam', 'provenance': [{'wikipedia_id': '43679538', 'title': 'King Arthur: Legend of the Sword', 'start_paragraph_id': 1, 'start_character': 192, 'end_paragraph_id': 1, 'end_character': 206, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '43679538', 'title': 'King Arthur: Legend of the Sword', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 398, 'bleu_score': 0.614202307479573, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15576771204003685432}, 'section': 'Section::::Abstract.'}]}]