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': "Erlenmeyer flask deformity of the femur is seen in all of the following, except \nSelect and explain. \nA. Osteopetrosis, B. Gaucher's disease, C. Thalassemia, D. Paget's disease", 'role': 'user'}, {'content': "Answer: D \nExplanation: Erlenmeyer flask deformity of lower end of femur is seen in\n\nGaucher's disease\nLead poisoning\xa0\nThalassemia\nOsteopetrosis", 'role': 'assistant'}]