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
Telescope fingers occur in - 
Select and explain. 
A. Rheumatic arthritis, B. Rheumatoid arthritis, C. Psoriatic arthritis, D. Reiter's arthritis
C: Psoriatic arthritis
Answer: C: Psoriatic arthritis 
Explanation: None