Question: who played the once ler in the lorax
[{'answer': 'Bob Holt', 'provenance': [{'wikipedia_id': '24179542', 'title': 'The Lorax (TV special)', 'start_paragraph_id': 10, 'start_character': 12, 'end_paragraph_id': 10, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}]