Question: when did the last season of jersey shore end
[{'answer': 'December 20 , 2012', 'provenance': [{'wikipedia_id': '25282459', 'title': 'Jersey Shore (TV series)', 'start_paragraph_id': 1, 'start_character': 96, 'end_paragraph_id': 1, 'end_character': 114, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]