Question: actor who starred as title character in prosperos books
[{'answer': 'John Gielgud', 'provenance': [{'wikipedia_id': '1608822', 'title': "Prospero's Books", 'start_paragraph_id': 1, 'start_character': 144, 'end_paragraph_id': 1, 'end_character': 156, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1608822', 'title': "Prospero's Books", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 905, 'bleu_score': 0.966433137724063, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17788931836138432432}, 'section': 'Section::::Abstract.'}]}]