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
Terminal interphalangeal joints of hands are commonly involved in - 
Select and explain. 
A. Psoriatic arthropathy, B. Rheumatoid arthritis, C. Still diseases, D. Ankylosing spondylitis
A: Psoriatic arthropathy
Answer: A: Psoriatic arthropathy 
Explanation: Amongst the given options, Terminal (Distal) interphalangeal joint is involved in Psoriatic arthritis and one pattern of involvement is arthritis of distal interphalangeal joint.