Question: who was the voice of clifford the big red dog
[{'answer': 'John Ritter', 'provenance': [{'wikipedia_id': '20316342', 'title': 'Clifford the Big Red Dog (TV series)', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20316342', 'title': 'Clifford the Big Red Dog (TV series)', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 512, 'bleu_score': 0.8234818445860701, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2426560305217840685}, 'section': 'Section::::Abstract.'}]}]