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: Medicine
Most common extraintestinal complication of ulcerative colitis is 
Select and explain. 
A. Arthritis, B. Uveitis, C. Episcleritis, D. Pyoderma gangrenosum
A: Arthritis
Answer: A: Arthritis 
Explanation: M/c Arthritis
Peripheral arthritis - responds to treatment
Axial arthritis -does not responds to treatment.