This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fracture Management, Subject name: Orthopaedics
[{'content': 'What causes mallet finger? \nSelect and explain. \nA. Extensor tendon rupture, B. Bony avulsion of distal phalanx at the extensor tendon, C. Strain and subsequent stretching of the extensor tendon, D. All the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Mallet finger: A finger flexed at the DIP joint due to avulsion or rupture of extensor tendon at the base of the distal phalanx. Mallet finger occur due to forced flextion of the finger tip. Hyper- extension splint is the treatment for atleast 6-8 weeks.', 'role': 'assistant'}]