Question: where does great wall of china start and end
[{'answer': 'from Dandong in the east'}, {'answer': 'to Lop Lake in the west'}, {'provenance': [{'wikipedia_id': '5094570', 'title': 'Great Wall of China', 'start_paragraph_id': 3, 'start_character': 112, 'end_paragraph_id': 3, 'end_character': 772, 'bleu_score': 0.576738247016173, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11292214741814397404}, 'section': 'Section::::Abstract.'}]}]