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
[{'content': 'Avascular necrosis seen in -a) # Surgical neck of humerusb) # Neck of scapulac) # Neck of talusd) # Neck of femure) # Neck of radius \nSelect and explain. \nA. ab, B. cd, C. bd, D. ac', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Amongst the given options only talus fracture (neck talus fracture) causes AVN.', 'role': 'assistant'}]