Question: when does sara tancredi come back in prison break
[{'answer': 'Season 4', 'provenance': [{'wikipedia_id': '27612845', 'title': 'Sara Tancredi', 'start_paragraph_id': 14, 'start_character': 11, 'end_paragraph_id': 14, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Appearances.:Season 3.\n'}]}, {'provenance': [{'wikipedia_id': '27612845', 'title': 'Sara Tancredi', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 2382, 'bleu_score': 0.9952774168305061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1995787153389961157}, 'section': 'Section::::Appearances.:Season 4.\n'}]}]