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': 'Terminal interphalangeal joints of hands are commonly involved in - \nSelect and explain. \nA. Psoriatic arthropathy, B. Rheumatoid arthritis, C. Still diseases, D. Ankylosing spondylitis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Amongst the given options, Terminal (Distal) interphalangeal joint is involved in Psoriatic arthritis and one pattern of involvement is arthritis of distal interphalangeal joint.', 'role': 'assistant'}]