Question: when did the last us wwi vet die
[{'answer': '4 February 2012', 'provenance': [{'wikipedia_id': '12556701', 'title': 'List of last World War I veterans by country', 'start_paragraph_id': 1, 'start_character': 196, 'end_paragraph_id': 1, 'end_character': 211, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12556701', 'title': 'List of last World War I veterans by country', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 588, 'bleu_score': 0.9196785619188741, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15830324144105698915}, 'section': 'Section::::Abstract.'}]}]