Question: when was the last time the 25th amendment was used
[{'answer': 'July 21 , 2007', 'provenance': [{'wikipedia_id': '70135', 'title': 'Twenty-fifth Amendment to the United States Constitution', 'start_paragraph_id': 51, 'start_character': 3, 'end_paragraph_id': 51, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Invocations.:Acting Presidents.:2007: Dick Cheney.\n'}]}]