Question: who won masterchef usa 2014 luca and natasha
[{'answer': 'Luca Manfè', 'provenance': [{'wikipedia_id': '39462622', 'title': 'MasterChef (American season 4)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 10, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '39462622', 'title': 'MasterChef (American season 4)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 165, 'bleu_score': 0.9321022168949711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17910275558699693447}, 'section': 'Section::::Abstract.'}]}]