Question: when did the tamils arrived in sri lanka
[{'answer': '2nd century BC', 'provenance': [{'wikipedia_id': '4096004', 'title': 'Sri Lankan Tamils', 'start_paragraph_id': 1, 'start_character': 339, 'end_paragraph_id': 1, 'end_character': 353, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4096004', 'title': 'Sri Lankan Tamils', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 765, 'bleu_score': 0.884658610181537, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4588467072696820580}, 'section': 'Section::::Abstract.'}]}]