Question: when did bob leave the bob and tom show
[{'answer': 'December 17 , 2015', 'provenance': [{'wikipedia_id': '1234884', 'title': 'Bob Kevoian', 'start_paragraph_id': 7, 'start_character': 202, 'end_paragraph_id': 7, 'end_character': 220, 'bleu_score': 1.0, 'section': 'Section::::Entertainment career.:Retirement.\n'}]}, {'provenance': [{'wikipedia_id': '1234884', 'title': 'Bob Kevoian', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 506, 'bleu_score': 0.817256449778869, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2149272298036781723}, 'section': 'Section::::Entertainment career.:Retirement.\n'}]}]