Question: who won great british bake off series 2
[{'answer': 'Joanne Wheatley', 'provenance': [{'wikipedia_id': '38293497', 'title': 'The Great British Bake Off (series 2)', 'start_paragraph_id': 2, 'start_character': 158, 'end_paragraph_id': 2, 'end_character': 173, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '38293497', 'title': 'The Great British Bake Off (series 2)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 173, 'bleu_score': 0.816927647530702, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1022759036837795108}, 'section': 'Section::::Abstract.'}]}]