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
Erlenmeyer flask deformity of the femur is seen in all of the following, except 
Select and explain. 
A. Osteopetrosis, B. Gaucher's disease, C. Thalassemia, D. Paget's disease
D: Paget's disease
Answer: D: Paget's disease 
Explanation: Erlenmeyer flask deformity of lower end of femur is seen in

Gaucher's disease
Lead poisoning 
Thalassemia
Osteopetrosis