Question: who is the main character in green eggs and ham
[{'answer': 'Sam - I - am', 'provenance': [{'wikipedia_id': '641293', 'title': 'Green Eggs and Ham', 'start_paragraph_id': 4, 'start_character': 556, 'end_paragraph_id': 4, 'end_character': 565, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}]