Question: when did the holstein cow come to america
[{'answer': '1830s'}, {'provenance': [{'wikipedia_id': '369836', 'title': 'Holstein Friesian cattle', 'start_paragraph_id': 37, 'start_character': 0, 'end_paragraph_id': 37, 'end_character': 461, 'bleu_score': 0.698096431741513, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8093872767173064586}, 'section': 'Section::::United States.:History.\n'}]}]