Question: when does celebrity big brother us start 2017
[{'answer': 'February 7 , 2018', 'provenance': [{'wikipedia_id': '55182921', 'title': 'Celebrity Big Brother (American TV series)', 'start_paragraph_id': 1, 'start_character': 229, 'end_paragraph_id': 1, 'end_character': 249, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]