Question: who led the confederate army in the battle of gettysburg
[{'answer': 'Robert E. Lee', 'provenance': [{'wikipedia_id': '4849', 'title': 'Battle of Gettysburg', 'start_paragraph_id': 1, 'start_character': 380, 'end_paragraph_id': 1, 'end_character': 393, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]