This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other disorders of bone, Subject name: Pediatrics
[{'content': 'In systemic form of JIA, all are true EXCEPT: \nSelect and explain. \nA. RA factor positive, B. High fever with rash, C. Hepatosplenomegaly, D. Elevated ESR', 'role': 'user'}, {'content': 'Answer: A \nExplanation: RA factor may be positive in polyahritis, but not in systemic onset JIA. Systemic form of JIA: High fever with rash Hepatosplenomegaly Elevated ESR Types of JIA Systemic JIA- Systemic involvement seen Oligoaicular- Affects four or fewer joints, often the knee or ankle. Polyaicular ahritis, rheumatoid factor negative Polyaicular ahritis, rheumatoid factor positive Psoriatic ahritis Enthesitis-related ahritis Undifferentiated ahritis', 'role': 'assistant'}]