Question: who won the last season of top chef
[{'answer': 'Joseph Flamm', 'provenance': [{'wikipedia_id': '52988089', 'title': 'Top Chef (season 15)', 'start_paragraph_id': 1, 'start_character': 432, 'end_paragraph_id': 1, 'end_character': 444, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '52988089', 'title': 'Top Chef (season 15)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 534, 'bleu_score': 0.9766041382465441, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9101888952791474525}, 'section': 'Section::::Abstract.'}]}]