Question: which actor won the oscar for best actor in 2009
[{'answer': 'Sean Penn', 'provenance': [{'wikipedia_id': '15933094', 'title': '81st Academy Awards', 'start_paragraph_id': 5, 'start_character': 190, 'end_paragraph_id': 5, 'end_character': 199, 'bleu_score': 1.0, 'section': 'Section::::Winners and nominees.\n'}]}, {'provenance': [{'wikipedia_id': '15933094', 'title': '81st Academy Awards', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 635, 'bleu_score': 0.8656028561215501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12801667817408912419}, 'section': 'Section::::Winners and nominees.\n'}]}]