Question: who is the american ambassador to the uk
[{'answer': 'Woody Johnson', 'provenance': [{'wikipedia_id': '857149', 'title': 'List of ambassadors of the United States to the United Kingdom', 'start_paragraph_id': 4, 'start_character': 60, 'end_paragraph_id': 4, 'end_character': 73, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]