Question: who is known as the last son of krypton
[{'answer': 'Superman', 'provenance': [{'wikipedia_id': '5135025', 'title': 'The Last Son of Krypton', 'start_paragraph_id': 2, 'start_character': 12, 'end_paragraph_id': 2, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'The Eradicator', 'provenance': [{'wikipedia_id': '5135025', 'title': 'The Last Son of Krypton', 'start_paragraph_id': 3, 'start_character': 12, 'end_paragraph_id': 3, 'end_character': 26, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Superman : Last Son of Krypton'}, {'answer': 'Superman : The Last Son of Krypton'}]