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
Commonest complication of Trans-cervical fracture of femur is - 
Select and explain. 
A. Non union, B. Malunion, C. Avascular necrosis, D. All of the above
C: Avascular necrosis
Answer: C: Avascular necrosis 
Explanation: AVN is the most common complication of femoral neck fracture.