This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculoskeletal  disorders, Subject name: Pediatrics
[{'content': 'Juvenile idiopathic ahriis includes all except: \nSelect and explain. \nA. Psoriatic ahritis, B. Enthesis-related ahritis, C. Systemic ahritis, D. Reactive ahritis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Reactive ahritis is not included in Juvenile Idiopathic ahritis: Classification of Juvenile Idiopathic ahritis (JIA) Oligoahritis (4 or lesser joints) (Most common type) Polyahritis (5 or more joints) Systemic JIA Psoriatic ahritis Enthesis-related ahritis Ref: Nelson textbook of pediatrics 21st edition Pgno: 1259', 'role': 'assistant'}]