Question: what is the name of currency of bhutan
[{'answer': 'ngultrum', 'provenance': [{'wikipedia_id': '490884', 'title': 'Bhutanese ngultrum', 'start_paragraph_id': 0, 'start_character': 10, 'end_paragraph_id': 0, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '490884', 'title': 'Bhutanese ngultrum', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 329, 'bleu_score': 0.8490127717855891, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13655096854707133694}, 'section': 'Section::::Abstract.'}]}]