Question: how many series of the great british bake off
[{'answer': '8', 'provenance': [{'wikipedia_id': '28962227', 'title': 'The Great British Bake Off', 'start_paragraph_id': 41, 'start_character': 18, 'end_paragraph_id': 41, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Series overview.:Series 7 (2016).\n'}]}]