Question: who won season 4 of america's got talent
[{'answer': 'Kevin Skinner', 'provenance': [{'wikipedia_id': '22790318', 'title': "America's Got Talent (season 4)", 'start_paragraph_id': 3, 'start_character': 44, 'end_paragraph_id': 3, 'end_character': 57, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]