Question: when did the llama first appear in north america
[{'answer': 'about 40 million years ago', 'provenance': [{'wikipedia_id': '18071', 'title': 'Llama', 'start_paragraph_id': 5, 'start_character': 74, 'end_paragraph_id': 5, 'end_character': 100, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18071', 'title': 'Llama', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 532, 'bleu_score': 0.9396430371117861, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8298243033680977892}, 'section': 'Section::::Abstract.'}]}]