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
Most common site of avascular necrosis amongst the following is - 
Select and explain. 
A. Medial candyle of femur #, B. Talus #, C. Olecranon #, D. Head of the radius #
B: Talus #
Answer: B: Talus # 
Explanation: Amongst the given options only talus fracture (neck talus fracture) causes AVN.