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: Surgery
In which of the following deformities is the distal interphalangeal joint flexed and proximal interphalangeal joint extended ? 
Select and explain. 
A. Boutonierre Deformity, B. Swan neck deformity, C. Z deformity, D. Claw Hand
B: Swan neck deformity
Answer: B: Swan neck deformity 
Explanation: Answer- B. Swan neck deformitySwan neck deformity: Hyperextension of PIP joint and flexion at DIP joint.