Question: who does the voice of elmo on sesame street
[{'answer': 'Kevin', 'provenance': [{'wikipedia_id': '772112', 'title': 'Kevin Clash', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 5, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Clash', 'provenance': [{'wikipedia_id': '772112', 'title': 'Kevin Clash', 'start_paragraph_id': 0, 'start_character': 6, 'end_paragraph_id': 0, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '772112', 'title': 'Kevin Clash', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 167, 'bleu_score': 0.8196189957582151, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7277387791977432201}, 'section': 'Section::::Abstract.'}]}]