Question: who was the first president to be killed in office
[{'answer': 'Abraham Lincoln', 'provenance': [{'wikipedia_id': '13434603', 'title': 'List of Presidents of the United States who died in office', 'start_paragraph_id': 2, 'start_character': 308, 'end_paragraph_id': 2, 'end_character': 323, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '13434603', 'title': 'List of Presidents of the United States who died in office', 'start_paragraph_id': 17, 'start_character': 0, 'end_paragraph_id': 17, 'end_character': 460, 'bleu_score': 0.838914221700584, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1296220922149313157}, 'section': 'Section::::1865: Abraham Lincoln.\n'}]}]