Question: cats the musical was based on a book of poems by which poet
[{'answer': 'T.S. Eliot', 'provenance': [{'wikipedia_id': '50007', 'title': "Old Possum's Book of Practical Cats", 'start_paragraph_id': 26, 'start_character': 316, 'end_paragraph_id': 26, 'end_character': 326, 'bleu_score': 1.0, 'section': 'Section::::Comparable work.\n'}]}, {'provenance': [{'wikipedia_id': '50007', 'title': "Old Possum's Book of Practical Cats", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 205, 'bleu_score': 0.8341232006119651, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9380448540922462418}, 'section': 'Section::::Abstract.'}]}]