This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ohopedics Oncology, Subject name: Orthopaedics
[{'content': 'X-ray proximal femur in a patient with pain hip. The deformity shown is: \nSelect and explain. \nA. Blade of grass deformity, B. Shepherd crook deformity, C. Chicken wire appearance, D. Corduroy appearance', 'role': 'user'}, {'content': 'Answer: B \nExplanation: "Fibrous dysplasia of proximal femur has shepherd crook deformity".', 'role': 'assistant'}]