Question: how many books in the wizard of oz
[{'answer': 'fourteen', 'provenance': [{'wikipedia_id': '564196', 'title': 'List of Oz books', 'start_paragraph_id': 1, 'start_character': 198, 'end_paragraph_id': 1, 'end_character': 206, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '564196', 'title': 'List of Oz books', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 587, 'bleu_score': 0.9815648442794911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9790217989933472873}, 'section': 'Section::::Abstract.'}]}]