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 is a complication of - \nSelect and explain. \nA. Fracture of talus, B. Fracture of medial condyle of femur, C. Olecranon fracture, D. Radial head fracture', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]