Question: what is the sequel to the wizard of oz
[{'answer': 'The Marvelous Land of Oz', 'provenance': [{'wikipedia_id': '583407', 'title': 'Return to Oz', 'start_paragraph_id': 1, 'start_character': 391, 'end_paragraph_id': 1, 'end_character': 415, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]