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
Diagnostic Criteria of JRA 
Select and explain. 
A. Disease persisting 6 weeks or longer, B. Onset before age 16 years, C. Ahritis involving >5 joints, D. Polyaicular JRA ANA is +ve
A: Disease persisting 6 weeks or longer
Answer: A: Disease persisting 6 weeks or longer 
Explanation: 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