Question: when did the last living civil war veteran died
[{'answer': 'August 2 , 1956', 'provenance': [{'wikipedia_id': '489300', 'title': 'Albert Woolson', 'start_paragraph_id': 6, 'start_character': 124, 'end_paragraph_id': 6, 'end_character': 139, 'bleu_score': 1.0, 'section': 'Section::::Biography.\n'}]}]