Question: where is the natural bridge located in virginia
[{'answer': 'Rockbridge County , Virginia', 'provenance': [{'wikipedia_id': '1360326', 'title': 'Natural Bridge (Virginia)', 'start_paragraph_id': 1, 'start_character': 44, 'end_paragraph_id': 1, 'end_character': 72, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1360326', 'title': 'Natural Bridge (Virginia)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 404, 'bleu_score': 0.8134452408640831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17813945877717537535}, 'section': 'Section::::Abstract.'}]}]