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: Orthopaedics
[{'content': "Hyperextension of PIP and Flexion of DIP is seen in which deformity \nSelect and explain. \nA. Swan neck, B. Mallet finger, C. Lumbricals paralysis, D. Boutonniere's", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]