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: Dental
Most common form of psoriatic arthritis 
Select and explain. 
A. Polyarthritis, B. Asymmetric oilgoarthritis, C. Symmetric oilgoarthritis, D. Asymmetric polyarthritis
B: Asymmetric oilgoarthritis
Answer: B: Asymmetric oilgoarthritis 
Explanation: Psoriatic arthritis is associated with HLAB27 and asymmetric oilgoarthritis is the most common form.