Question: when does the nba season end this year
[{'answer': 'April 11 , 2018', 'provenance': [{'wikipedia_id': '53555999', 'title': '2017–18 NBA season', 'start_paragraph_id': 36, 'start_character': 58, 'end_paragraph_id': 36, 'end_character': 73, 'bleu_score': 1.0, 'section': 'Section::::Regular season.\n'}]}, {'provenance': [{'wikipedia_id': '53555999', 'title': '2017–18 NBA season', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 703, 'bleu_score': 0.8362833222393451, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16261776113305699985}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '53555999', 'title': '201718 NBA season', 'section': 'Section::::Regular season.\n', 'start_paragraph_id': 36, 'end_paragraph_id': 36, 'meta': {'evidence_span': ['The regular season began on October 17, 2017 and ended on April 11, 2018.', 'The regular season began on October 17, 2017 and ended on April 11, 2018.', 'The regular season began on October 17, 2017 and ended on April 11, 2018.']}}]}]