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
Earliest radiological change in RA - 
Select and explain. 
A. Decreased joint space, B. Articular erosion, C. Periarticular osteopenia, D. Subchondral cyst
C: Periarticular osteopenia
Answer: C: Periarticular osteopenia 
Explanation: "The radiographic findings in early RA are normal or soft tissue swelling and periarticular osteopenia". ___ Mayo clinic