Question: when did the zulu arrive in south africa
[{'answer': 'the 9th century'}, {'provenance': [{'wikipedia_id': '34427', 'title': 'Zulu people', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 472, 'bleu_score': 0.7645017949042331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14579342749058453128}, 'section': 'Section::::History.:Origins.\n'}]}]