Question: who was involved in the battle of york
[{'answer': 'United Kingdom'}, {'answer': 'Upper Canada', 'provenance': [{'wikipedia_id': '249746', 'title': 'Battle of York', 'start_paragraph_id': 1, 'start_character': 120, 'end_paragraph_id': 1, 'end_character': 132, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Ojibway', 'provenance': [{'wikipedia_id': '249746', 'title': 'Battle of York', 'start_paragraph_id': 1, 'start_character': 379, 'end_paragraph_id': 1, 'end_character': 386, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'United States', 'provenance': [{'wikipedia_id': '249746', 'title': 'Battle of York', 'start_paragraph_id': 5, 'start_character': 163, 'end_paragraph_id': 5, 'end_character': 176, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}]