Question: who donates a christmas tree to trafalgar square
[{'answer': 'Oslo , Norway', 'provenance': [{'wikipedia_id': '22141582', 'title': 'Trafalgar Square Christmas tree', 'start_paragraph_id': 1, 'start_character': 104, 'end_paragraph_id': 1, 'end_character': 121, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'the city of Oslo , Norway'}, {'provenance': [{'wikipedia_id': '22141582', 'title': 'Trafalgar Square Christmas tree', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 239, 'bleu_score': 0.9517713210466091, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15680636970460560029}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '22141582', 'title': 'Trafalgar Square Christmas tree', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The Trafalgar Square Christmas tree is a Christmas tree donated to the people of Britain by the city of Oslo, Norway each year since 1947.', 'The Trafalgar Square Christmas tree is a Christmas tree donated to the people of Britain by the city of Oslo, Norway each year since 1947. The tree is prominently displayed in Trafalgar Square from the beginning of December until 6 January.', 'The Trafalgar Square Christmas tree is a Christmas tree donated to the people of Britain by the city of Oslo, Norway']}}]}]