Question: which geographic feature lies east of the andes mountains
[{'answer': 'sedimentary basins', 'provenance': [{'wikipedia_id': '1354', 'title': 'Andes', 'start_paragraph_id': 14, 'start_character': 661, 'end_paragraph_id': 14, 'end_character': 679, 'bleu_score': 1.0, 'section': 'Section::::Geology.\n'}]}, {'provenance': [{'wikipedia_id': '1354', 'title': 'Andes', 'start_paragraph_id': 14, 'start_character': 16, 'end_paragraph_id': 14, 'end_character': 1283, 'bleu_score': 0.903094991193721, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3726946292567947595}, 'section': 'Section::::Geology.\n'}]}]