Question: the city that was site of the single bloodiest day in american history
[{'answer': 'Sharpsburg', 'provenance': [{'wikipedia_id': '84849', 'title': 'Battle of Antietam', 'start_paragraph_id': 1, 'start_character': 53, 'end_paragraph_id': 1, 'end_character': 63, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '84849', 'title': 'Battle of Antietam', 'start_paragraph_id': 1, 'start_character': 11, 'end_paragraph_id': 1, 'end_character': 618, 'bleu_score': 0.8140995614546611, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16239742017113740156}, 'section': 'Section::::Abstract.'}]}]