Question: who won the great british bake off season 5
[{'answer': 'Nancy Birtwhistle', 'provenance': [{'wikipedia_id': '43390600', 'title': 'The Great British Bake Off (series 5)', 'start_paragraph_id': 1, 'start_character': 310, 'end_paragraph_id': 1, 'end_character': 327, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '43390600', 'title': 'The Great British Bake Off (series 5)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 387, 'bleu_score': 0.9694566079002921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1523851938407734700}, 'section': 'Section::::Abstract.'}]}]