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
A 35 - year old male develops involvements of PIP,DIP and metacarpo phalangeal joints with sparing of wrist and carpometacarpal joints. The probable diagnosis is - 
Select and explain. 
A. Psoriatic arthopathy, B. Osteo arthritis, C. Rheumatoid arthritis, D. Pseudo gout
A: Psoriatic arthopathy
Answer: A: Psoriatic arthopathy 
Explanation: None