Question: who starred in the original west side story
[{'answer': 'Larry Kert', 'provenance': [{'wikipedia_id': '33928', 'title': 'West Side Story', 'start_paragraph_id': 15, 'start_character': 513, 'end_paragraph_id': 15, 'end_character': 523, 'bleu_score': 1.0, 'section': 'Section::::Background.:Production period.\n'}]}, {'answer': 'Carol Lawrence', 'provenance': [{'wikipedia_id': '33928', 'title': 'West Side Story', 'start_paragraph_id': 80, 'start_character': 432, 'end_paragraph_id': 80, 'end_character': 446, 'bleu_score': 1.0, 'section': 'Section::::Productions.:Original Broadway production.\n'}]}, {'answer': 'Michael Callan', 'provenance': [{'wikipedia_id': '33928', 'title': 'West Side Story', 'start_paragraph_id': 80, 'start_character': 581, 'end_paragraph_id': 80, 'end_character': 595, 'bleu_score': 1.0, 'section': 'Section::::Productions.:Original Broadway production.\n'}]}, {'answer': 'Ken LeRoy'}, {'answer': 'Chita Rivera', 'provenance': [{'wikipedia_id': '33928', 'title': 'West Side Story', 'start_paragraph_id': 15, 'start_character': 528, 'end_paragraph_id': 15, 'end_character': 540, 'bleu_score': 1.0, 'section': 'Section::::Background.:Production period.\n'}]}]