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': 'Joints of hand are not affected in - \nSelect and explain. \nA. AS, B. RA, C. OA, D. Psoriatic arthritis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ankylosing spondylitis does not affect hand and foot joint.\nOA, RA and psoriatic arthritis affect hand joints.', 'role': 'assistant'}]