Question: where did the siege of petersburg take place
[{'answer': 'Petersburg , Virginia', 'provenance': [{'wikipedia_id': '77667', 'title': 'Siege of Petersburg', 'start_paragraph_id': 1, 'start_character': 64, 'end_paragraph_id': 1, 'end_character': 85, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]