Question: how many copies of green eggs and ham where sold
[{'answer': '8 million', 'provenance': [{'wikipedia_id': '641293', 'title': 'Green Eggs and Ham', 'start_paragraph_id': 1, 'start_character': 120, 'end_paragraph_id': 1, 'end_character': 129, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]