Question: who was the last outlaw to be tried convicted & hanged for train robbery
[{'answer': 'Thomas E. Ketchum'}, {'provenance': [{'wikipedia_id': '2293226', 'title': 'Tom Ketchum', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 178, 'bleu_score': 0.80364315327331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 259633257065341601}, 'section': 'Section::::Abstract.'}]}]