This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': "A characteristic feature of Still's disease - \nSelect and explain. \nA. Prominent kidney involvement, B. Rashes, C. Positive Rheumatoid factor, D. Neutropenia", 'role': 'user'}, {'content': "Answer: B \nExplanation: Stills disease is a variant of rheumatoid commonly occurring in adults in 20's and 30's.\nPatients characteristics clinical features are:\n\n\nHigh spiking fever often up to 40°C.\nSore throat\nEvanescent salmon coloured non pruritic rash, seen on chest & abdomen\nLymphadenopathy\nPericardial effusion\nWrist joint involvement\n\n\nChances are that you might confuse it with Felty's syndrome so I am giving the important features of both these conditions together", 'role': 'assistant'}]