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: Orthopaedics
[{'content': "False about SAPHO syndrome \nSelect and explain. \nA. Rheumatoid factor negative, B. 'P' stands for psoriasis, C. HLA B-27 positive, D. 'S' stands for synovitis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: SAPHO -\nS - Synovitis\nA - Acne\nP - Pustulosis palmoplantar\nH - Hyperostosis\nO - Osteitis', 'role': 'assistant'}]