Question: how many episodes are in chicago fire season 4
[{'answer': '23', 'provenance': [{'wikipedia_id': '46380025', 'title': 'Chicago Fire (season 4)', 'start_paragraph_id': 1, 'start_character': 296, 'end_paragraph_id': 1, 'end_character': 298, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46380025', 'title': 'Chicago Fire (season 4)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 307, 'bleu_score': 0.9603762111511761, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5536099806038090343}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '46380025', 'title': 'Chicago Fire (season 4)', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The fourth season of "Chicago Fire", an American drama television series with executive producer Dick Wolf, and producers Derek Haas, Michael Brandt, and Matt Olmstead, was ordered on February 5, 2015, by NBC, and premiered on October 13, 2015 and concluded on May 17, 2016. The season contained 23 episodes.', 'The fourth season of "Chicago Fire", an American drama television series with executive producer Dick Wolf, and producers Derek Haas, Michael Brandt, and Matt Olmstead, was ordered on February 5, 2015, by NBC, and premiered on October 13, 2015 and concluded on May 17, 2016. The season contained 23 episodes.\rhighlight sentence(s) containing evidence, not only the answer', 'The fourth season of "Chicago Fire", an American drama television series with executive producer Dick Wolf, and producers Derek Haas, Michael Brandt, and Matt Olmstead, was ordered on February 5, 2015, by NBC, and premiered on October 13, 2015 and concluded on May 17, 2016. The season contained 23 episodes.']}}]}]