Question: who played the boy in river of no return
[{'answer': 'Tommy Rettig', 'provenance': [{'wikipedia_id': '1925869', 'title': 'River of No Return', 'start_paragraph_id': 3, 'start_character': 297, 'end_paragraph_id': 3, 'end_character': 309, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}, {'provenance': [{'wikipedia_id': '1925869', 'title': 'River of No Return', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 583, 'bleu_score': 0.9567532579243251, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17787891502018027662}, 'section': 'Section::::Plot.\n'}]}]