Question: when were christmas trees first introduced to england
[{'answer': 'some two centuries ago', 'provenance': [{'wikipedia_id': '7770', 'title': 'Christmas tree', 'start_paragraph_id': 36, 'start_character': 182, 'end_paragraph_id': 36, 'end_character': 204, 'bleu_score': 1.0, 'section': 'Section::::History.:18th to early 20th centuries.:Britain.\n'}]}, {'provenance': [{'wikipedia_id': '7770', 'title': 'Christmas tree', 'start_paragraph_id': 36, 'start_character': 0, 'end_paragraph_id': 36, 'end_character': 632, 'bleu_score': 0.9029697448477051, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11988181086501557989}, 'section': 'Section::::History.:18th to early 20th centuries.:Britain.\n'}]}]