Question: who plays the voice of sterling in cars 3
[{'answer': 'Nathan Fillion', 'provenance': [{'wikipedia_id': '41498488', 'title': 'Cars 3', 'start_paragraph_id': 1, 'start_character': 637, 'end_paragraph_id': 1, 'end_character': 651, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]