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': "Avulsion of extensor tendon give rise to? \nSelect and explain. \nA. Mallet finger, B. Dupuytren's contracture, C. Trigger finger, D. Swan neck deformity", 'role': 'user'}, {'content': 'Answer: A \nExplanation: It is the flexion deformity of the distal interphalangeal joint usually due to avulsion of extensor tendon of distal phalanx. Ref: Current Diagnosis & Treatment in Ohopedics 3/e, page 538,564-65.', 'role': 'assistant'}]