Question: who explored the main land of south america
[{'answer': 'European conquerors', 'provenance': [{'wikipedia_id': '26769', 'title': 'South America', 'start_paragraph_id': 5, 'start_character': 107, 'end_paragraph_id': 5, 'end_character': 126, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '26769', 'title': 'South America', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 344, 'bleu_score': 0.9118021019905901, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16479856174961883547}, 'section': 'Section::::Abstract.'}]}]