Question: which mountain range lies to the east of north america
[{'answer': 'Appalachian Mountains', 'provenance': [{'wikipedia_id': '6545069', 'title': 'Geography of North America', 'start_paragraph_id': 5, 'start_character': 183, 'end_paragraph_id': 5, 'end_character': 204, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6545069', 'title': 'Geography of North America', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 592, 'bleu_score': 0.9788329837059241, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10641053947943413533}, 'section': 'Section::::Abstract.'}]}]