Question: when did the prickly pear come to australia
[{'answer': 'the 19th century', 'provenance': [{'wikipedia_id': '27777921', 'title': 'Prickly pears in Australia', 'start_paragraph_id': 2, 'start_character': 73, 'end_paragraph_id': 2, 'end_character': 89, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '27777921', 'title': 'Prickly pears in Australia', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 533, 'bleu_score': 0.8017606868481041, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8939718011635421447}, 'section': 'Section::::Abstract.'}]}]