Question: where does the american ambassador live in london
[{'answer': 'Winfield House', 'provenance': [{'wikipedia_id': '1486077', 'title': 'Winfield House', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]