Question: who did mercer and mancini write the song moon river for
[{'answer': 'Audrey Hepburn', 'provenance': [{'wikipedia_id': '534458', 'title': 'Moon River', 'start_paragraph_id': 1, 'start_character': 110, 'end_paragraph_id': 1, 'end_character': 124, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '534458', 'title': 'Moon River', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 649, 'bleu_score': 0.9808590314834971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8752727676487699027}, 'section': 'Section::::Versions.:Original.\n'}]}]