Question: who was the president when the civil war started
[{'answer': 'Lincoln', 'provenance': [{'wikipedia_id': '863', 'title': 'American Civil War', 'start_paragraph_id': 1, 'start_character': 456, 'end_paragraph_id': 1, 'end_character': 463, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '863', 'title': 'American Civil War', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 950, 'bleu_score': 0.9865312178338931, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16217935964056386649}, 'section': 'Section::::Overview.\n'}]}]