Question: who won the battle of pickett's charge
[{'answer': 'Union', 'provenance': [{'wikipedia_id': '469583', 'title': "Pickett's Charge", 'start_paragraph_id': 1, 'start_character': 119, 'end_paragraph_id': 1, 'end_character': 124, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]