Question: how many kilometers of length does the andes mountain range cover
[{'answer': 'is about 7,000 km'}, {'provenance': [{'wikipedia_id': '1354', 'title': 'Andes', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 519, 'bleu_score': 0.550517003887748, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5275849122331636744}, 'section': 'Section::::Abstract.'}]}]