Question: what mountain range is in sun valley idaho
[{'answer': 'Rocky Mountain', 'provenance': [{'wikipedia_id': '110624', 'title': 'Sun Valley, Idaho', 'start_paragraph_id': 9, 'start_character': 286, 'end_paragraph_id': 9, 'end_character': 300, 'bleu_score': 1.0, 'section': 'Section::::History.:Union Pacific Railroad (1936–64).\n'}]}]