Question: who wrote king arthur and the round table
[{'answer': 'Roger Lancelyn Green', 'provenance': [{'wikipedia_id': '23510411', 'title': 'King Arthur and His Knights of the Round Table', 'start_paragraph_id': 1, 'start_character': 82, 'end_paragraph_id': 1, 'end_character': 102, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '23510411', 'title': 'King Arthur and His Knights of the Round Table', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 411, 'bleu_score': 0.9716239638199891, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8714607537935025071}, 'section': 'Section::::Abstract.'}]}]