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
[{'content': 'In which of the following deformities is the distal interphalangeal joint flexed and proximal interphalangeal joint extended ? \nSelect and explain. \nA. Boutonierre Deformity, B. Swan neck deformity, C. Z deformity, D. Claw Hand', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Answer- B. Swan neck deformitySwan neck deformity: Hyperextension of PIP joint and flexion at DIP joint.', 'role': 'assistant'}]