Question: who was the longest held pow in vietnam
[{'answer': 'Floyd James', 'provenance': [{'wikipedia_id': '661672', 'title': 'Floyd James Thompson', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '661672', 'title': 'Floyd James Thompson', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 302, 'bleu_score': 0.962600167205617, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9847821215730450251}, 'section': 'Section::::Abstract.'}]}]