Question: how many series of game of thrones is there
[{'answer': '6', 'provenance': [{'wikipedia_id': '31120069', 'title': 'List of Game of Thrones episodes', 'start_paragraph_id': 15, 'start_character': 18, 'end_paragraph_id': 15, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Episodes.:Season 5 (2015).\n'}]}]