Question: when does season 3 of live pd start
[{'answer': 'September 21 , 2018', 'provenance': [{'wikipedia_id': '53219190', 'title': 'Live PD', 'start_paragraph_id': 2, 'start_character': 373, 'end_paragraph_id': 2, 'end_character': 392, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '53219190', 'title': 'Live PD', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 504, 'bleu_score': 0.9768747032089851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12831496187212262754}, 'section': 'Section::::Abstract.'}]}]