Question: who plays as alvin in alvin and the chipmunks
[{'answer': 'Justin Long', 'provenance': [{'wikipedia_id': '11244593', 'title': 'Alvin and the Chipmunks (film)', 'start_paragraph_id': 1, 'start_character': 205, 'end_paragraph_id': 1, 'end_character': 216, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '11244593', 'title': 'Alvin and the Chipmunks (film)', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 32, 'bleu_score': 0.5081327481546141, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5392783946351585964}, 'section': 'Section::::Cast.\n'}]}]