Question: which season of pretty little liars does alison come back
[{'answer': 'seventh and final season', 'provenance': [{'wikipedia_id': '49091814', 'title': 'Pretty Little Liars (season 7)', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '49091814', 'title': 'Pretty Little Liars (season 7)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 268, 'bleu_score': 0.9560167778278961, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13322847297748594517}, 'section': 'Section::::Abstract.'}]}]