Question: when does ziva come back to ncis season 7
[{'answer': 'first episode of season seven', 'provenance': [{'wikipedia_id': '23377412', 'title': 'NCIS (season 7)', 'start_paragraph_id': 2, 'start_character': 7, 'end_paragraph_id': 2, 'end_character': 36, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '23377412', 'title': 'NCIS (season 7)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 546, 'bleu_score': 0.978606533029418, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2234560135409373343}, 'section': 'Section::::Abstract.'}]}]