Question: who does the voice of big bird on sesame street
[{'answer': 'Caroll Edwin Spinney', 'provenance': [{'wikipedia_id': '161208', 'title': 'Caroll Spinney', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '161208', 'title': 'Caroll Spinney', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 370, 'bleu_score': 0.7963435656936071, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7129014082060565468}, 'section': 'Section::::Abstract.'}]}]