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': 'Diagnostic Criteria of JRA \nSelect and explain. \nA. Disease persisting 6 weeks or longer, B. Onset before age 16 years, C. Ahritis involving >5 joints, D. Polyaicular JRA ANA is +ve', 'role': 'user'}, {'content': 'Answer: A \nExplanation: It is defined as ahritis of one or more joints with onset below 16 yr age and persisting for atleast 6 weeks Ref Ghai pediatrics eighth edition pg no 625', 'role': 'assistant'}]