Question: when did the vikings come to north america
[{'answer': 'late 10th century AD', 'provenance': [{'wikipedia_id': '295764', 'title': 'Norse colonization of North America', 'start_paragraph_id': 1, 'start_character': 53, 'end_paragraph_id': 1, 'end_character': 73, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '295764', 'title': 'Norse colonization of North America', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 398, 'bleu_score': 0.8683487742803291, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11034516823262406140}, 'section': 'Section::::Abstract.'}]}]