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': 'Which of the following is false regarding systemic juvenile idiopathic ahritis (sJIA)? \nSelect and explain. \nA. RA factor positive, B. High fever with rash, C. Hepatosplenomegaly, D. Elevated ESR', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Rheumatoid ahritis (RA) factor is negative in systemic-onset JIA ; it is positive in polyahritic type of JIA. Ref: Nelson textbook of pediatrics 21st edition. Pgno: 1260', 'role': 'assistant'}]