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: Medicine
Disease where distal interphalangeal joint is characteristically involved - 
Select and explain. 
A. Psoriatic arthritis, B. Rheumatoid, C. SLE, D. Gout
A: Psoriatic arthritis
Answer: A: Psoriatic arthritis 
Explanation: None