Question: what is the latest george rr martin book
[{'answer': 'A Dance with Dragons', 'provenance': [{'wikipedia_id': '27795131', 'title': 'The Winds of Winter', 'start_paragraph_id': 4, 'start_character': 153, 'end_paragraph_id': 4, 'end_character': 173, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}]