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': 'The most common site of fracture neck of the femur that causes avascular necrosis is - \nSelect and explain. \nA. Sub-capital, B. Intertrochanteric, C. Trans-cervical, D. Basal', 'role': 'user'}, {'content': 'Answer: A \nExplanation: "The more proximal the location of a femoral neck fracture, the more likely there is to be nonunion and/or AVN".\xa0— Musculoskeletal trauma\n\nThus non-union and AVN will be most common in subcapital fracture and least in basicervical fracture.', 'role': 'assistant'}]