Question: when did the first nations arrive in canada
[{'answer': 'at least 15,000 years ago'}, {'provenance': [{'wikipedia_id': '196075', 'title': 'Indigenous peoples in Canada', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 775, 'bleu_score': 0.9012014639269811, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9647849957230125741}, 'section': 'Section::::History.:Paleo-Indians period.\n'}]}]