Question: how many books are there in the lunar chronicles
[{'answer': '5', 'provenance': [{'wikipedia_id': '34453703', 'title': 'The Lunar Chronicles', 'start_paragraph_id': 13, 'start_character': 117, 'end_paragraph_id': 13, 'end_character': 118, 'bleu_score': 1.0, 'section': 'Section::::Books.:"Fairest".\n'}]}]