Question: what is the second book in the game of thrones
[{'answer': 'A Clash of Kings', 'provenance': [{'wikipedia_id': '12301', 'title': 'A Song of Ice and Fire', 'start_paragraph_id': 7, 'start_character': 1056, 'end_paragraph_id': 7, 'end_character': 1072, 'bleu_score': 1.0, 'section': 'Section::::Plot synopsis.\n'}]}]