Question: which president was the general in charge of the union army during the civil war
[{'answer': 'Grant', 'provenance': [{'wikipedia_id': '46720', 'title': 'William Tecumseh Sherman', 'start_paragraph_id': 3, 'start_character': 461, 'end_paragraph_id': 3, 'end_character': 466, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46720', 'title': 'William Tecumseh Sherman', 'start_paragraph_id': 87, 'start_character': 0, 'end_paragraph_id': 87, 'end_character': 1016, 'bleu_score': 0.9881300380564421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2584444169697300413}, 'section': 'Section::::General of the Army.\n'}]}]