Question: who wrote the lyrics for porgy and bess
[{'answer': 'author DuBose Heyward', 'provenance': [{'wikipedia_id': '219642', 'title': 'Porgy and Bess', 'start_paragraph_id': 1, 'start_character': 116, 'end_paragraph_id': 1, 'end_character': 137, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'lyricist Ira Gershwin', 'provenance': [{'wikipedia_id': '219642', 'title': 'Porgy and Bess', 'start_paragraph_id': 1, 'start_character': 142, 'end_paragraph_id': 1, 'end_character': 163, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '219642', 'title': 'Porgy and Bess', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 304, 'bleu_score': 0.7946586059855071, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5125372080658517495}, 'section': 'Section::::Abstract.'}]}]