Question: who won season four of the great british bake off
[{'answer': 'Frances', 'provenance': [{'wikipedia_id': '40211950', 'title': 'The Great British Bake Off (series 4)', 'start_paragraph_id': 3, 'start_character': 50, 'end_paragraph_id': 3, 'end_character': 57, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]