Question: where is area code 406 located in usa
[{'answer': 'Montana', 'provenance': [{'wikipedia_id': '5836733', 'title': 'Area code 406', 'start_paragraph_id': 1, 'start_character': 70, 'end_paragraph_id': 1, 'end_character': 77, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]