Question: who was the first character on sesame street
[{'answer': 'Big Bird', 'provenance': [{'wikipedia_id': '19906938', 'title': 'Sesame Street characters', 'start_paragraph_id': 8, 'start_character': 11, 'end_paragraph_id': 8, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::General information.:Muppets.\n'}]}]