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
Joints of hand are not affected in - 
Select and explain. 
A. AS, B. RA, C. OA, D. Psoriatic arthritis
A: AS
Answer: A: AS 
Explanation: Ankylosing spondylitis does not affect hand and foot joint.
OA, RA and psoriatic arthritis affect hand joints.