Question: who was the last pow released from vietnam
[{'answer': 'Robert Russell Garwood', 'provenance': [{'wikipedia_id': '4603167', 'title': 'Robert R. Garwood', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4603167', 'title': 'Robert R. Garwood', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 241, 'bleu_score': 0.9517713210466091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12929145841798283672}, 'section': 'Section::::Abstract.'}]}]