Question: the first collaboration of richard rodgers and oscar hammerstein ii was
[{'answer': 'Oklahoma !', 'provenance': [{'wikipedia_id': '199825', 'title': 'Rodgers and Hammerstein', 'start_paragraph_id': 37, 'start_character': 49, 'end_paragraph_id': 37, 'end_character': 59, 'bleu_score': 1.0, 'section': 'Section::::Legacy.\n'}]}, {'provenance': [{'wikipedia_id': '199825', 'title': 'Rodgers and Hammerstein', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 759, 'bleu_score': 0.9631973285424701, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13978218216295795001}, 'section': 'Section::::Early work.:"Oklahoma!".\n'}]}]