Question: what type of currency is used in london england
[{'answer': 'Pound Sterling', 'provenance': [{'wikipedia_id': '270680', 'title': 'Banknotes of the pound sterling', 'start_paragraph_id': 0, 'start_character': 17, 'end_paragraph_id': 0, 'end_character': 31, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]