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
False about SAPHO syndrome 
Select and explain. 
A. Rheumatoid factor negative, B. 'P' stands for psoriasis, C. HLA B-27 positive, D. 'S' stands for synovitis
B: 'P' stands for psoriasis
Answer: B: 'P' stands for psoriasis 
Explanation: SAPHO -
S - Synovitis
A - Acne
P - Pustulosis palmoplantar
H - Hyperostosis
O - Osteitis