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: Orthopaedics
[{'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: Boutonniere deformity: flexion contracture of PIP joint and extension of DIP jointSwan neck deformity: Hyperextension of PIP joint and flexion at DIP jointZ-deformity: radial detion of the wrist with ulnar detion of fingers(Refer: Mohindra's Fundamentals of Ohopedics, 2nd edition, pg no. 420)", 'role': 'assistant'}]