Question: how many countries is there in south america
[{'answer': 'twelve', 'provenance': [{'wikipedia_id': '26769', 'title': 'South America', 'start_paragraph_id': 2, 'start_character': 167, 'end_paragraph_id': 2, 'end_character': 173, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '26769', 'title': 'South America', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 603, 'bleu_score': 0.9536330554540541, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13885450205550851064}, 'section': 'Section::::Abstract.'}]}]