<prompt> Mallet finger is:Avulsion fracture of extensor tendon of distal phalanxFracture of distal phalanxFracture of middle phalanxFracture of proximal phalanx  <response>: Ans: a Avulsion fracture of extensor tendon of distal phalanxRef: Maheshwari Ortho, 3rd ed, p. 100 