Question: how many seasons are there of the leftovers
[{'answer': 'third and final season', 'provenance': [{'wikipedia_id': '39715412', 'title': 'The Leftovers (TV series)', 'start_paragraph_id': 2, 'start_character': 482, 'end_paragraph_id': 2, 'end_character': 504, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '39715412', 'title': 'The Leftovers (TV series)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 620, 'bleu_score': 0.616015514546992, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8235487916192511178}, 'section': 'Section::::Abstract.'}]}]