Question: what is the biggest mountain in south america
[{'answer': 'Aconcagua', 'provenance': [{'wikipedia_id': '220167', 'title': 'Aconcagua', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 9, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '220167', 'title': 'Aconcagua', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 580, 'bleu_score': 0.6320788003158251, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14180263255315172041}, 'section': 'Section::::Abstract.'}]}]