Question: who wrote the grapes of wrath about migrant workers
[{'answer': 'John Steinbeck', 'provenance': [{'wikipedia_id': '42645', 'title': 'The Grapes of Wrath', 'start_paragraph_id': 1, 'start_character': 60, 'end_paragraph_id': 1, 'end_character': 74, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '42645', 'title': 'The Grapes of Wrath', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 134, 'bleu_score': 0.5167726601618741, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12131512366646940453}, 'section': 'Section::::Abstract.'}]}]