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
Avulsion of extensor tendon give rise to? 
Select and explain. 
A. Mallet finger, B. Dupuytren's contracture, C. Trigger finger, D. Swan neck deformity
A: Mallet finger
Answer: A: Mallet finger 
Explanation: 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.