This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
Differentiating point between psoriatic and rheumatoid ahritis are the following except 
Select and explain. 
A. Pencil-in-cup deformity, B. Telescoping of phalanges, C. Mael's sign, D. Tufting of phalanges
C: Mael's sign
Answer: C: Mael's sign 
Explanation: Mael's sign is the overhanging edge sign of tophaceous gout. Ref - Radiologyassistant.org